LONDON----Here’s a new warning from health experts: Sitting is deadly.
Scientists are increasingly warning that sitting for prolonged periods — even if you also exercise regularly — could be bad for your health. And it doesn’t matter where the sitting takes place — at the office, at school, in the car or before a computer or TV — just the overall number of hours it occurs. Several studies suggest people who spend most of their days sitting are more likely to be fat, have a heart attack or even die.
　　In an editorial published this week in the British Journal of Sports Medicine, Elin EkblomBak of the Swedish School of Sport and Health Sciences suggested that authorities rethink how they define physical activity to highlight the dangers of sitting.
　　While health officials have issued guidelines recommending minimum amounts of physical activity, they haven’t suggested people try to limit how much time they spend in a seated position.
　　"After four hours of sitting, the body starts to send harmful signals," Ekblom-Bak said. She explained that genes regulating(調(diào)節(jié)) the amount of glucose（葡萄糖） and fat in the body start to shut down.
　　Even for people who exercise, spending long periods of time sitting at a desk is still harmful. Tim Armstrong, a physical activity expert at the World Health Organization, said people who exercise every day — but still spend a lot of time sitting — might get more benefit if that exercise were spread across the day, rather than in a single bout.（一回）
　　Still, in a study published last year that tracked more than 17,000 Canadians for about a dozen years, researchers found people who sat more had a higher death risk, independently of whether or not they exercised.
　　"We don’t have enough evidence yet to say how much sitting is bad," said Peter Katzmarzyk of the Pennington Biomedical Research Center in Baton Rouge, who led the Canadian study. "But it seems the more you can get up and interrupt this sedentary behavior, the better."
　　Figures from a U.S. survey in 2003-2004 found Americans spend more than half their time sitting, from working at their desks to sitting in cars.
　　Experts said more research is needed to figure out just how much sitting is dangerous, and what might be possible tooffset those effects.
　　"People should keep exercising because that has a lot of benefits," Ekblom-Bak said. "But when they’re in the office, they should try to interrupt sitting as often as possible," she said.
【小題1】What is the best title for the text?

A．Not Sitting Too Much While Working	B．How To Avoid Sitting Too Much
C．Sitting Too Much Could Be Deadly	D．More And More People Sit Too Much

【小題2】According to the research,______________.

A．the more time you spend in exercising in a single bout, the healthier you will be.

B．those who often sit too much are sure to grow fat or suffer from a heart attack.

C．regular exercise is effective to get rid of the side effect of sitting too much.

D．you had better not sit for more than four hours in a single bout.

【小題3】How does the danger of sitting too much affect the human body?

A．It results in a higher death risk.

B．It increases glucose and fat in the body.

C．It makes a person unable to exercise long enough in a day.

D．It causes the gene to fail to balance the glucose and fat in the body.

【小題4】In the opinion of Ekblom-Bak, you’d better have a rest in the office by________.

A．sending your friends e-mails

B．having a walk around your office

C．chatting online or playing computer games

D．listening to music with your head on the desk.

During the years after the terrorist attack on the World Trade Center, structural engineers have been trying hard to solve a question that would otherwise have been completely unthinkable: Can building be designed to stand catastrophic blasts (攻擊；爆破) by terrorists?
Soon after the terrorist attacks on the twin towers, structural engineers from the University at Buffalo and the Multidisciplinary Center for Earthquake Engineering Research (MCEER) traveled to ground zero as part of a project funded by the National Science Foundation. They spent two days beginning the task of formulating (構(gòu)思) ideas about how to design such structures and to search for clues on how to do so in buildings that were damaged, but still are standing.
“Our objective in visiting ground zero was to go and look at the buildings surrounding the World Trade Center, those buildings that are still standing, but that sustained damage,” said Mr. Bruneau, Ph.D. “Our immediate hope is that we can develop a better understanding as to why those buildings remain standing, while our long-term goal is to see whether earthquake engineering technologies can be married to existing technologies to achieve enhanced performance of buildings in the event of terrorist attacks,” he added.
Photographs taken by the investigators demonstrate the monumental damage to the World Trade Center towers and buildings nearby. One building a block away from the towers remains standing, but was badly damaged. “This building is many meters away from the World Trade Center and yet we see a column (柱子) there that used to be part of that building,” explained A. Whittaker, Ph.D. “The column became a missile that shot across the road, through the window and through the floor.”
The visit to the area also brought some surprises, according to the engineers. For example, the floor framing (框架) system in one of the buildings was quite strong , allowing floors that were pierced by tons of falling debris (殘礫) to survive. “Good framing systems may provide a simple, but reliable strategy for blast resistance,” he added. Other strategies may include providing alternate paths for gravity loads in the event that a load-bearing column fails. “We also need a better understanding of the mechanism of collapse,” said A. Whittaker. “We need to find out what causes a building to collapse and how you can predict it.”
A. Reinhorn, Ph.D. noted that “earthquake shaking has led to the collapse of buildings in the past. Solutions developed for earthquake-resistant design may apply to blast engineering and terrorist-resistant design. Part of our mission now is to transfer these solutions and to develop new ones where none exist at present.”
【小題1】The question raised in the first paragraph is one _____ .

A．that was asked by structural engineers a month ago

B．that is too difficult for structural engineers a month ago

C．that was never thought of before the terrorist attack

D．that terrorists are eager to find a solution to

【小題2】The column mentioned by Dr. Whittaker _____ .

A．was part of the building close to the World Trade Center

B．was part of the World Trade Center

C．was shot through the window and the floor of the World Trade Center

D．damaged many buildings near the World Trade Center

【小題3】A surprising discovery made by the investigators during their visit to ground zero is that _____.

A．floors in the faraway buildings remained undamaged

B．some floor framing systems demonstrate resistance to explosion

C．complex floor framing systems are more blast resistant

D．floors in one of the buildings were pierced by tons of debris

【小題4】 What Dr. Reinhorn said in the last paragraph may imply all the following EXCEPT that _____.

A．blast engineers should develop new solutions for terror-resistant design

B．blast engineering can borrow technologies developed for terror-resistant design

C．solutions developed for earthquake-resistant design may apply to terrorist-resistant design

D．blast engineering emerges as a totally new branch of science

A lazy Susan is an addition to a table, which is designed to assist in moving food from one person to another while dining. This is accomplished through the use of a turntable(轉(zhuǎn)盤), which usually moves the food in a circle when pushed by those at table. In this way, the food never has to be picked up and passed around the table. Instead, it remains in place as the lazy Susan is turned about.
A lazy Susan may also be a part of a kitchen cabinet. One may spin the lazy Susan in order to find certain goods stored in it. From the outside, a lazy Susan appears to be two cabinets. When one of these cabinets is pushed, however, both doors move and the lazy Susan is revealed inside.
Whether the lazy Susan is on a tabletop or within a cabinet, it can be made of a variety of materials. Most commonly, a lazy Susan is made of either plastic, wood or glass. Some people believe that Thomas Jefferson invented the lazy Susan, though it was referred to as a dumb waiter(上菜升降架) at that time. It is said that Jefferson invented the lazy Susan because his daughter complained she was always served last at table and, as a result, never found herself full when leaving the table. Others believe that Thomas Edison was the inventor, as he is believed to have invented the turntable for his phonograph(留聲機), which later developed into the lazy Susan.
Regardless of who invented it, it wasn’t until 1917 that the term lazy Susan was created in an advertisement for the invention. In Britain, however, the term dumb waiter is still used rather than the term lazy Susan. The reason for the name lazy Susan remains a mystery. One theory is that it was named after either Jefferson’s or Edison’s daughter, both of whom were named Susan.
【小題1】 According to the passage, a lazy Susan _____.

A．is a person who serves food at table

B．is a waitress who helps move dinner tables

C．is an additional round table in a dining room

D．is a turntable that passes food around the table

【小題2】Which of the following is NOT true of the lazy Susan?

A．On a tabletop, it is convenient for people to have dinner.

B．Within a cupboard, it is easy for people to see what is inside.

C．The turntable was invented in 1917.

D．It can be made of many kinds of materials.

【小題3】Why did Jefferson’s daughter complain she was served last when having meals?

A．Because she was too lazy.

B．Because she was the youngest.

C．Because the table was too tall for her.

D．Because the table couldn’t move food for her.

【小題4】 From the passage, we can know that _____.

A．the lazy Susan was invented earlier than the phonograph

B．Susan was the name of Jefferson’s and Edison’s daughter

C．Jefferson and Edison invented the lazy Susan at the same time

D．When people talk about a lazy waitress they use the term “Susan”

【小題5】What is the main idea of the passage?

A．What is a lazy Susan?

B．When was the lazy Susan created?

C．Why do inventions come from the daily life?

D．How was “dumb waiter” replaced by “l(fā)azy Susan”?

it tastes just chicken
Away from home, eating is more than just a way to keep your stomach full．It is a language all its own, and no words can say, "Glad to meet you ．．．glad to be doing business with you ．．．" quite like sharing a meal offered by your host．
Clearly, mealtime is not the time for you to say, "Thanks, but no thanks．" Acceptance of the food on your plate means acceptance of host, country, and company．So, no matter how difficult it may be to swallow, swallow．Or, as one experienced traveler says, "Travel with a cast-iron stomach and eat everything everywhere．"
Often, the food offered represents proudly your host country's eating culture．What would Ataiericans think of a French person who refused to take a bite of homemade apple pie or sirloin? Our discomfort comes not so much from the thing itself; it comes from our umamiliarity with it．After all, an oyster has remarkably the same look as a sheep's eye; and a first look at a lobster would remind almost anybody of a creature from a science fiction movie, not something you dip in butter and eat．By the way, in Saudi Arabia sheep's eyes are a famous dish and in parts of China it's bear's paw soup．
Can you refuse such food without being rude? Most experienced business travelers say no, at least not before taking at least a few bites．It helps, though, to slice any item very thin．This way, you minimize the taste and the reminder of where it came from．Or, " Swallow it quickly, " as one traveler recommends．"I still can't tell you what sheep's eyeballs taste like．" As for dealing with taste, the old line that "it tastes just like chicken" is often thankfully true．Even when the "it" is really rat or snake．
Another useful piece of advice is not knowing what you are eating．What's for dinner? Don't ask． Avoid glancing into the kitchen or looking at English-language menus．Your host will be pleased that you are eating the food he offers, and who knows? Maybe it really is chicken in that soup．
【小題1】The purpose of the article is to ____．

A．introduce unfamiliar food

B．share the writer's personal experiences

C．suggest ways to overcome a cultural barrier

D．a(chǎn)dvise on how to politely refuse to eat foreign food

【小題2】According to the writer, people hesitate at strange food mainly due to ____．

A．the way it looks	B．safety worries
C．lack of information about it	D．the unfamiliar atmosphere

【小題3】From the article we can infer that ____．

A．a(chǎn)n American may feel comfortable with sirloin

B．one should refuse strange food after a few bites

C．English-language menus are not always dependable

D．one needs a cast-iron stomach to travel in other cultures

【小題4】One may say "It tastes just like chicken．" when ____．

A．showing respect for chicken-loving nations

B．greeting people with different dieting habits

C．evaluating chefs at an international food festival

D．getting someone to try a visually unpleasant meal

Scientists warn today that the Atlantic bluefin tuna（金槍魚）faces disappearance unless certain action is taken. They used electronic ways to track the movement of the powerful fish from the Gulf of Mexico to the Mediterranean, and report today in the journal Nature that meals of sushi and sandwiches with tuna worldwide are more dangerous than anyone has imagined.
The bluefin tuna can live for 30 years, grow to three metres in length and weigh as much as 700kg. A good one can fetch as much as £ 52,000 in the Tokyo fish markets. “In my lifetime, we’ve brought this big fish to the doorstep of death in the western Atlantic Ocean,” said Barbara Block of Stanford University in California. “The electronic way of tracks provides the best scientific information we’ve ever had to manage these tuna and we must, as an international community, start to act actively to make sure of the future of this fish. ”
Scientists have repeatedly said that the harvest of the seas cannot be as good as before. There are fewer and fewer fish in around Newfoundland, North Sea and Iceland, so fishermen have pushed further offshore in search of deep ocean fish. Tuna—in the Mediterranean and Japan—have been under increasing pressure for years. The International Commission on the Conservation of Atlantic Tuna has tried to manage the fish since 1969．There are two populations: a western one that has dropped by 80% in the past 30 years, and a larger, eastern population. Although catches are controlled by 3,000 tons a year in the western fishery, and 32,000 in the east, no one knew whether the limits worked.
So Professor Block and her team placed tracks on hundreds of the fish and tracked them to depths of more than 900 metres and on journeys of thousands of miles, measuring the movement, body and water temperatures. “There are two ways to save the Atlantic bluefin tuna—protect them in their production grounds and in their feeding grounds,” Prof. Block said. “This will need immediate action in both the central Atlantic, to reduce the loss of the big fish while hunting, and in the Gulf of Mexico and Mediterranean, where tuna produce as separate populations. ”
【小題1】 The bluefin tuna in this passage mainly refers to the one _______.

A．in the Atlantic	B．in the Pacific
C．in the Gulf of Mexico	D．in the Mediterranean

【小題2】Which of the following is NOT true according to this passage?

A．The bluefin tuna is a kind of large and heavy fish.

B．The number of the bluefin tuna in the sea is getting smaller and smaller.

C．Scientists are worried about the future of the tuna.

D．Scientists think that the harvest of the seas will remain good.

【小題3】According to Professor Block, tuna can be saved by ______.

A．finding a new way to protect them

B．controlling the catches of them

C．reducing the population to eat them

D．protecting them in their production and feeding grounds

【小題4】The purpose of the passage is to ______.

A．tell people a new way has been found to save the bluefin tuna

B．call for action to save the bluefin tuna

C．warn people not to eat tuna sandwiches anymore

D．help scientists to find a new way to save the bluefin tuna

Googlefight is a simple service available on the Internet which offers you the chance to compare two different items and see how many hits they get on the Google search engine. The seemingly simple device has proved invaluable to users, especially to help win arguments.
For example, imagine that you and your friends are arguing about who are the most popular music or movie stars, you can decide the argument by writing the names in the Googlefight boxes. Let’s say that you are arguing about Jackie Chan and Jet Li. You will quickly discover that Jet Li is mentioned 16 million times on Google pages, whereas Jackie Chan is mentioned a mere 12 million times! In this unscientific way, you can claim victory for one Star over another.
But teachers have come up with ways of using Googlefight which are much more useful from an academic point of view, particularly when it comes to studying languages. You can, for example, find out the frequency of two words with the same meaning, and deduce (推斷) from the answers which one is more common. For example, let’s take the words “buy” and “purchase”, which mean the same thing (although “buy” is only a verb and “purchase” is both a verb and a noun). It is immediately clear from Googlefight that “buy” is much more commonly used, with a massive three and a half billion hits, compared to only one billion occurrences for the more formal word.
But the real value of Googlefight to the language learner is in determining which is the more common of two phrases. For example, “raining cats and dogs” is an old-fashioned English expression about the weather. Do English speakers still use it? Or are they more likely to say “pouring down”? Googlefight suggests the latter. “Pouring down” has 898,000 Google hits, whereas “raining cats and dogs” only has 326,000.
With phrases, it’s important to remember that you need to use quote marks to make the search more accurate. For example, if you type in the similar phrases “l(fā)ook after” and “take care of “ without quote marks, the second phrase seems to be more common, but with quote marks, the result is reversed.
【小題1】What is Googlefight?

A．A fight between two people on Google.

B．A way to make sure you win an argument.

C．A website showing how many hits two different things have.

D．A list of all the websites on Google.

【小題2】Language teachers find it useful because _______.

A．there are a lot of words on Googlefight

B．it can tell them which of the two words with the same meaning appears more often

C．some words mean the same thing

D．common words have a billion hits

【小題3】What must you remember to do if you are checking phrases by Googlefight?

A．Make sure they mean be same thing.

B．Make sure they are different.

C．Remember to put quote marks round the phrase.

D．Don’t put quote marks round the phrase.

【小題4】Which statement is NOT true according to the passage?

A．Googlefight is effective to determine the more common of two phrases.

B．Googlefight is a scientific way to decide an argument.

C．Quote marks can make the search more accurate.

D．Googlefight is invaluable to help win arguments.

Simply by analyzing a drop of blood, a doctor will be able to diagnose a birth defect or even cancer when it is in the early stage; using new technology, a material lighter but much stronger than steel can be produced.
These may sound like dreams at present. But the dreams may soon come true as research findings in laboratories are being turned into products more rapidly in the new century, according to experts participating in the fourth Asia-Pacific Economic Cooperation (APEC) Technomart, a technology exhibition and trade fair in Suzhou.　　
"Most people think nano-technology（納米技術(shù)）is too far-fetched to be real. But in fact nano-technology has been applied in a wide range of fields, such as medicine. It is coming into our daily life," said Cheng Jiachong from a Hong Kong-based nano-technology firm.
Nano-technology based on the nanometer, the unit of which is a billionth of a meter, enables scientists to have new concepts of disease diagnosis and treatment on a molecular（分子）and atomic scale, Cheng said.　　
By using nanometer particles, a doctor can separate the fetus cells（胚胎細胞）from the blood of a pregnant woman to see if the development of the fetus is normal. This method is also being used in the early diagnosis of cancer and heart disease, he said.　　
One of the most significant impacts of nano-technology is at the bio-inorganic materials interface, according to Greg Tegart, executive advisor of the APEC Center for Technology Foresight.　　
"By combining enzymes（酶）and silicon chips we can produce biosensors. These could be implanted in humans or animals to monitor health and to deliver corrective doses（劑量）of drugs," he told the participants a technology forum during the exhibition.　　
"Nano-technology could affect the production of nearly every man-made object, from automobiles, tires and computer circuits（電路）, to advanced medicines and tissue replacement, and lead to the invention of objects yet to be imagined," said David Minns, a special advisor to the National Research Council of Canada.　　
It has been shown that carbon nano-tubes are ten times as strong as steel, with one sixth of the weight, and nano-scale systems have the potential to make supersonic transport cost- effective and to increase computer efficiency by millions of times, he said.
The experts agreed that the APEC technology exhibition and trade fair provided many chances for exchanges of innovative ideas and products.
【小題1】Realization of the dreams mentioned in the first paragraph will mainly base on ________.

A．APEC	B．Chinese scientist
C．the APEC Center for Technology Foresight	D．Nano-technology

【小題2】The length of a nanometer equals to ______.

A．meter

B．meter

C．meter

D．meter

【小題3】We can imply from what David Minns said that _________.

A．Nano-technology could only be used to invent new objects.

B．Nano-technology could be widely used to produce or invent objects.

C．Nano-technology is a money-consuming technology.

D．Nano-technology can not be used to improve the service of Internet.

【小題4】Compared to steel, carbon nano-tubes are ________.

A．stronger and lighter	B．lighter but as strong
C．stronger but as light	D．poor in quality

Space travel is definitely bad for astronauts’ bones, reducing their bone density(密度) after only a month of weightlessness, according to French research published on Friday.
Laurence Vico and his fellow workers at St Etienne University called for more research into the effects of microgravity, after their study of 15 astronauts from the Russian MIR station showed bone loss continued throughout space flights.
“Bone loss was especially striking in four astronauts, ” the scientists reported in the Lancet Medical Journal.
They measured the bone mineral density (BMD) of bones in the forearm(前臂) and lower leg of the astronauts who had spent one to six months in space.
The BMD loss was significant in the tibia(脛骨) of the lower leg, a weight-bearing bone, but barely changed in the radius(橈骨) of the forearm. “Our results indicate the need to investigate not only different bones, but also different areas of the same bone since not all sites of the skeleton (骨架) are similarly affected by space conditions, ” they added.
Without gravity the body isn’t bearing any weight so there is no need for calcium (鈣) which makes bones strong, and it becomes empty into the bloodstream.
The research team suggested in future scientists should try to determine if the loss of bone density was only on weight-bearing bones on longer flights, also the possible recovery after returning to Earth.
【小題1】French scientists did their research on Russian astronauts, because _______.

A．they only cared for the Russian astronauts

B．they were not interested in their own astronauts

C．the Russian government invited them to do their research

D．the Russian astronauts worked in space for a long time

【小題2】 Scientists have found that _______.

A．the BMD loss may cause serious illness to astronauts

B．the BMD loss may cause some change in astronauts’ bodies

C．a(chǎn)stronauts shouldn’t care about the BMD loss

D．a(chǎn)stronauts should take some calcium before space travel

【小題3】 What cause the BMD loss to astronauts, according to this passage?

A．The food they eat in space.	B．The drinks they take in space.
C．The temperature in space.	D．The gravity in space.

【小題4】In the third paragraph, the word “striking” means ______.

A．unusual

B．simple

C．weak

D．slow

Scientists made a great break through this year in England when the first "test tube" baby was born．The birth was the result of many years of research by doctors．The doctors did the research in groups to help the women who cannot conceive a baby in the normal way．
What happened when the baby was born "from a test tube"? Well, the baby did not literally grow in a test tube．The first stage of the process was that the egg from the woman and the sperm from the man were put together in the test tube．After all, the embryo was put into the womb of a woman．This process was difficult．But it was successful, so the baby was eventually born, like any other, from a woman, only the woman wasn't the baby's real mother, but a sort of "carrier" of a baby produced by another couple．
Obviously, this method is to help to couples who can't have children because of physical problems in the woman．But very difficult moral problems arise in the kind of situation．Take it for instance, a case that happened this year．A couple who wanted a baby advertised for a woman to have a child by the father of the couple．They offered the woman a lot of money．The woman was made pregnant by artificial insemination; in this case, the woman "employed" to bear the child was its real mother．When the baby was born, the woman refused to give it back to the couple．But, in the eyes of the law, the woman had a right to keep the children because she was its biological mother．
You could argue that we should change the law to deal with this kind of situation．In earlier times, there were always healthy babies needing adoption, because family planning methods were not so effective as they are now．These days, however, most of the children who can be adopted are over six years old, often handicapped in some way．So a couple who want a young healthy baby cannot always adopt one, this is why the "test tube" baby is in demand．But is it normally right to use this method? Should we temper with nature in this way? Even if we change the law, would this be the right step to take ?
【小題1】The birth of the first "test-tube" baby is a great advance _____．

A．on medical science

B．in birth control

C．on the research for babies

D．in the lives of married women

【小題2】When we say a baby was born "from a test-tube", we mean_____ ．

A．the baby didn't develop in the womb of a woman

B．the baby has no biological parents

C．the embryo was formed in the test tube

D．the baby grew in the test-tube before it was born

【小題3】According to the law, who has right to keep the baby produced by the artificial method?

A．The couple who want a baby．

B．The biological mother of the child．

C．The person who pays the money to the real mother．

D．The father who advertises for a biological mother．

【小題4】According to the passage, people need "test-tube baby" because_____ ．

A．family planning methods are not effective．

B．they can't always adopt a young healthy baby

C．they are unwilling to adopt a child．

D．there are so many babies needing adoption．

Supermarkets are trying out new computers that make shopping carts more intelligent. They will help shoppers find paper cups or toilet soap, and keep a record of the bill.
The touch-screen devices are on show at the Food Marketing Institute’s exhibition here this week, “These devices are able to create value and get you around the store quicker,” said Michael Alexander, manager of Springboard Retail Networks Inc., which makes a smart cart computer called the Concierge.
Canadian stores will test the Concierge in July. A similar device, IBM’s “Shopping Buddy”, has recently been test-marketed at Stop & Shop stores in Massachusetts.
Neither device tells you how many fat grams or calories are in your cart, but they will flash you with items on sale. The idea is to make it easier for people to buy, not to have second thoughts that maybe you should put something back on the shelf.
“The whole model is driven by advertisers’ need to get in front of shoppers,” said Alexander. “They’re not watching 30-second TV ads anymore.”
People can use a home computer to make their shopping lists. Once at the store, a shopper can use a preferred customer card to start a system（系統(tǒng)）that will organize the trip around the store. If you’re looking for toothpicks, you type in the word or pick it from a list, and a map will appear on the screen showing where you are and where you can find them.
The device also keeps a record of what you buy. When you’re finished, the device figures out your bill. Then you go to the checker or place your card into a self-checkout stand and pay.
The new computerized shopping assistants don’t come cheap. The Buddy devices will cost the average store about $ 160, 000, and the Concierge will cost stores about $ 500 for each device.
【小題1】The underlined word “they”（paragraph 1）refers to ____________.

A．supermarkets	B．shop assistants
C．shopping carts	D．shop managers

【小題2】We can learn from the last paragraph that ___________.

A．intelligent shopping carts cost a large sum of money

B．the Concierge is cheaper than the Buddy devices

C．shop assistants with computer knowledge are well paid

D．a(chǎn)verage stores prefer the Concierge to the Buddy devices

【小題3】What might be the most suitable title for the text?

A．New age for supermarkets

B．Concierge and Shopping Buddy

C．New computers make shopping carts smarter

D．Touch-screen devices make shopping enjoyable