An e-book is usually much______ than an ordinary paper book.

A．more expensiveB．the most expensive

C．most expensiveD．expensive

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：初中英語 來源：2016年天津市南開區(qū)九年級上學(xué)期期末考試英語試卷（解析版） 題型：單項填空

Liu Xiang won the gold medal． We ________ him．

A．took pride inB．were surprised at

C．were worried aboutD．took care of

查看答案和解析>>

科目：初中英語 來源：2016年北京市懷柔區(qū)九年級上學(xué)期期末考試英語試卷（解析版） 題型：閱讀理解

There’s no pizza on Mars, but scientists have found a solution to this problem for hungry astronauts: a pizza printer! NASA, the American space agency, has developed a machine that “prints” food. They showed a model of the printer in Austin, Texas last month.

How does it work? Cartridges(墨盒) filled with powdered dough(面粉團(tuán)), cheese, sauce, water and oil put the ingredients layer(層)by layer onto a printer bed. The printer bed, which gets hot from below, cooks the food as it’s being printed.

Since most of the ingredients are powdered, they can be sent into space and stored for many years without going bad. Water makes food go sour, so the food powders are mixed with water and oil only when they are being printed.

“Long-distance space travel requires more than 15 years of shelf life for food.” says Anjan Contractor, whose company developing the printer. “ We take water out, and in that form, food will last maybe 30 years.”

In outer space, there are far fewer choices for astronauts for dinner. Most of their foods—even things like beef or shrimp—are eaten from bags as powders（粉末）. Scientists hope the new food printer can be used to make more delicious food in outer space, keeping astronauts healthier and happier.

But the printer is not limited to use in outer space. Scientists think it could be useful on Earth, too. It could allow personal meals to be made at the dinner table, according to each person’s different needs.

“Let’s say someone is an athlete in the family, and he needs more protein(蛋白質(zhì)),” says Anjan Contractor, founder of Systems and Materials Research Corp, the company developing the printer. “We can design recipes for him and print out more protein-nutritious food for him.”

1.In outer space, food can be stored for many years without going bad_______.

A．when it’s mixed with water

B．when it’s mixed with oil

C．when it’s powdered

D．when it’s put in the fridge

2.Which of the following is TRUE? ______

A．Astronauts eat beef powder in outer space.

B．A model of the food printer was shown in New York last month.

C．Only astronauts and athletes can eat the food from the printer.

D．The printer can only be used in outer space.

3.What is the best title for this passage? _______

A．Astronauts’ Life in Outer Space

B．Hungry? Just Print!

C．How to Make Pizza

D．Long Lasting Food

查看答案和解析>>

科目：初中英語 來源：2016年北京市大興區(qū)九年級上學(xué)期期末考試英語試卷（解析版） 題型：其他題

閱讀短文，根據(jù)短文內(nèi)容回答問題。

On June 26th, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could now read the whole “map” of the human body: DNA. DNA is something that all humans have, and it tells the body what to do. DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own. Now we can read some of this “map”, and so we can find out more about how our bodies work.

People have been trying to understand the human body for a long time. In 1860, Gregory Mendel discovered that there is a special reason why we look the same as other people in our family. It is because of small things called “genes” that we have in our body. In 1953, James Watson and Francis Crick made another discovery and found out that those small parts are really messages written in the DNA with a special language.

In 1961, Marshall Nirenberg and Johann Matthaei found the first “word” that they could understand in that language, showing how DNA tells the cell to build its parts. This meant that one day we would be able to read all the messages that a human body gets from its parents’ bodies. Scientists have now found all the words in DNA map, but we still do not understand what they all do. By understanding what just one “word” means, we can help save people from several diseases. So the more we understand, the more doctors will be able to do.

Most people hope that this will help to make better medicine and help people who are very ill. Other people worry about that when we learn more words and find out lots of other information, we still use it in the wrong way, just to make people more attractive, or stop sick people getting jobs.

1.Could Francis and Craig read the “map” of DNA in 2000?

2.Why do we look like our parents?

3.When was the first “word” of DNA discovered?

4.What can the doctors do if we understand some messages in DNA?

5.What does the writer tell us in the last paragraph?

查看答案和解析>>

科目：初中英語 來源：2016年北京市大興區(qū)九年級上學(xué)期期末考試英語試卷（解析版） 題型：單項填空

The lights in my room _______off when I left yesterday morning.

A．turnB．turned

C．a(chǎn)re turnedD．were turned

查看答案和解析>>

科目：初中英語 來源：2014-2015學(xué)年重慶梁平縣虎城中學(xué)九年級上學(xué)期期中英語試卷（解析版） 題型：單詞拼寫

短文填空。

根據(jù)下列短文內(nèi)容，在短文后的空格處填上一個恰當(dāng)?shù)脑~，使短文完整、通順。

Tang Ling often smoked cigarettes(香煙) in his school’s washing room. He started smoking 1.the age of 14. One day he learnt that the NBA star Yao Ming, an ambassador(大使) to the Chinese Association on Tobacco Control (中國控?zé)焻f(xié)會), asked people not to smoke. Yao Ming was Tang’s favorite star,2. his words meant a lot to him. He decided to3.up smoking.

According to the Chinese Association on Tobacco Control, about 350 million Chinese smoke. Among4. , 50 million are teenagers. Sun Jiangping of Beijing University said, “ Teenagers can get cigarettes easily , especially when their parents smoke or shops sell cigarettes to them. It’s very important5.parents to help their children stop smoking.”A 15-year-old boy named Li Kun from Beijing said his 6.didn’t smoke. Because they thought smoking could make people feel badly ill, they only allowed him to play with friends without smoking. Living in such a good family helped Li say 7.to cigarettes. Some of his smoking classmates once told Li that smoking made boys look8., but Li disagreed. He said, “Smoking is unhealthy and it’s not cool at all. Please stop smoking now!”

查看答案和解析>>

科目：初中英語 來源：2014-2015學(xué)年重慶梁平縣虎城中學(xué)九年級上學(xué)期期中英語試卷（解析版） 題型：閱讀理解

Traveling is one of the most important activities and people have been interested in it for many years. Modern traffic develops fast, so traveling to different places has become much easier than before.

Staying healthy while traveling can make your trip happier. But do you know how to keep healthy during a trip? The following information may be useful for you.

Before leaving:

Wear comfortable shoes, a hat and sunglasses.

Take some necessary medicine with you. They can be used when you get sick or have other problems.

If you do lots of sports like walking or climbing on your trip, you should do some exercise for weeks or months before you leave.

While traveling:

Be sure not to eat dirty food or bad fruit.

Have enough time to take a rest during your trip.

Tap water(自來水) is not safe, so drink bottled water and always clean the cover on the bottle.

1.You should ______ before you leave your home for a trip.

A. get some medicine

B. clean the cover

C. drink much water

D. wear warm clothes

2.You had better not _______ while you are having a trip.

A. wear sunglasses

B. be too tired

C. wear a hat

D. take a rest

3.If you ________ while traveling, your trip will be happier.

A. walk fast

B. eat too much

C. keep healthy

D. climb the mountain

查看答案和解析>>

科目：初中英語 來源：2014-2015學(xué)年重慶梁平縣虎城中學(xué)九年級上學(xué)期期中英語試卷（解析版） 題型：單項填空

The story _____ three years ago.

A. started B. took

C. took place D. began

查看答案和解析>>

科目：初中英語 來源：2014-2015學(xué)年浙江寧波寧海縣躍龍中學(xué)九年級上學(xué)期10月月考英語試卷（解析版） 題型：閱讀理解

Soon computers and other machines will be able to remember you by looking at your eyes! The program works because everyone’s eyes are different. So in the future you won’t have to remember a number when you want to use a machine or take money out of a bank. You’ll just have to look at the machine and it will be able to tell who you are.

The eye-recognition(眼睛識別) program is already being tested in shops and banks in the USA, Britain and France. Soon, this technology(技術(shù)) will change all other ways of finding out who people are.

However, scientists are working on other systems. Machines will soon be able to know you from the shape of your face or hands or even your smell! We already have machines that can tell who you are from your voice or the mark made by your fingers.

Eye-recognition is better than other kinds because your eyes don’t change as you get older, or get dirty like hands or fingers. And even twins have different eyes, so the program can be up to 94％ correct, depending on how good the technology is. Some programs may only be right 51％ of the time. In Britain, it was found that 91％ of people who had tried it said that they liked the idea of eye-recognition.

In the future your computer will be looking at you in the eye. So smile!

1. What is the advantage of using the eye-recognition program?

A. You needn’t use a machine.

B. You needn’t remember a number.

C. You needn’t look at the machine.

D. You needn’t take some money with you.

2.How does the eye-recognition program work?

A. You type in your number.

B. You show your ID card.

C. You look at the machine.

D. You say your name.

3.Why can the eye-recognition program be up to 94％ correct?

A. Because eyes hardly change.

B. Because hands or fingers can get dirty.

C. Because people like the idea of the program.

D. Because the program is widely used around the world.

4.Which of the following is TRUE?

A. The program is being tested in Japan.

B. Computers can remember you by looking at your clothes.

C. 91％ of people in Britain don’t like the idea of the eye-recognition program.

D. Machines with other systems will also tell who you are in the future.

查看答案和解析>>

同步練習(xí)冊答案