Two new studies suggest that modern running shoes could increase the risk of injuries to runners.
One study involved sixty-eight healthy young women and men who ran at least twenty-four kilometers a week. The runners were observed on a treadmill machine (跑步機(jī)). Sometimes they wore running shoes. Other times they ran barefoot (赤腳).
Researchers from the JKM Technologies company in Virginia, the University of Virginia and the University of Colorado did the study.
They found that running shoes create more stress that could damage knees, hips and ankle joints than running barefoot. They observed that the effect was even greater than the effect reported earlier for walking in high heels.
The study appeared in the official scientific journal of The American Academy of Physical Medicine.
The other study appeared in the journal Nature. It compared runners in the United States and Kenya. The researchers were from Harvard University in Massachusetts, Moi University in Kenya and the University of Glasgow in Scotland.
They divided the runners into three groups. One group had always run shoeless. Another group had always run with shoes. And the third group had changed to shoeless running.
Runners who wear shoes usually come down heel first. That puts great force on the back of the foot. But the study found that barefoot runners generally land on the front or middle of their foot. That way they ease into their landing and avoid striking their heel.
Harvard’s Daniel Lieberman led the study. He says the way most running shoes are designed may explain why those who wear them land on their heels. The heel of the shoe is bigger and heavier than other parts of the shoe, so it would seem more likely to come down first. Also, the heel generally has thick material under it to soften landings.
But the researchers do not suggest that runners immediately start running barefoot. They say it takes some training. And there can be risks, like running when your feet are too cold to feel if you get injured.
The study was partly supported by Vibram, which makes a kind of footwear that it says is like running barefoot. The findings have gotten a lot of attention. But the researchers say there are many problems in the way the press has reported in their paper. So they have tried to explain their findings on a Harvard Website.
【小題1】What’s the main idea of the passage?
A.Walking in high heels could cause less serious effects than running barefoot. |
B.Two new discoveries encourage people to run in high heels. |
C.Running in shoes is partly good to runners. |
D.Two new studies prove running without shoes is beneficial to runners in most cases. |
A.Toes. | B.Hips. | C.Feet. | D.Legs. |
A.The way that we run by landing on the front or middle of our foot could avoid damaging our heel. |
B.We should start running barefoot in no time. |
C.Running in modern running shoes could cause more serious effects than running in high heels. |
D.We won’t be injured if we run barefoot. |
A.Persuasive. | B.Negative. | C.Objective. | D.Supportive. |
【小題1】D
【小題2】B
【小題3】A
【小題4】C
解析試題分析:文章主要闡述了兩項(xiàng)研究的結(jié)果。兩項(xiàng)新的研究顯示,穿跑鞋對(duì)運(yùn)動(dòng)員的傷害會(huì)很大,而赤腳跑步能夠減輕對(duì)膝蓋、腳踝等的傷害。
【小題1】根據(jù)第一段“Two new studies suggest that modern running shoes could increase the risk of injuries to runners.”第四段“They found that running shoes create more stress that could damage knees, hips and ankle joints than running barefoot.”和第八段“But the study found that barefoot runners generally land on the front or middle of their foot. That way they ease into their landing and avoid striking their heel.”可知,這兩項(xiàng)研究都表明,赤腳跑步對(duì)運(yùn)動(dòng)員更有益處,故選D。
【小題2】根據(jù)第四段“They found that running shoes create more stress that could damage knees, hips and ankle joints than running barefoot.”可知,跑鞋會(huì)帶來更多的壓力,從而對(duì)膝蓋、臀部和踝關(guān)節(jié)造成傷害。故選B。
【小題3】根據(jù)倒數(shù)第四段“But the study found that barefoot runners generally land on the front or middle of their foot. That way they ease into their landing and avoid striking their heel.”可知,赤腳跑步的運(yùn)動(dòng)員,腳的前部或中部先落地,這樣做會(huì)減輕落地時(shí)的沖擊,不會(huì)傷到腳后跟,故選A。
【小題4】根據(jù)“Two new studies suggest that modern running shoes could increase the risk of injuries to runners.
They found that running shoes create more stress that could damage knees, hips and ankle joints than running barefoot. ...Runners who wear shoes usually come down heel first. That puts great force on the back of the foot.”可知,兩項(xiàng)研究都顯示,跑鞋對(duì)運(yùn)動(dòng)員的傷害很大,作者反對(duì)穿跑鞋進(jìn)行跑步。故選C。
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科目:高中英語 來源: 題型:閱讀理解
Electric cars are dirty.In fact,not only are they dirty,they might even be more dirty than their gasolinepowered cousins.
People in California love to talk about “zeroemissions vehicles”,but_people_in_California_seem_to_be_clueless_about_where_electricity_comes_from.Power plants mostly use fire to make it.Aside from the new folks who have their roofs covered with solar cells,we get our electricity from generators.Generators are fueled by something—usually coal,oil,but also by heat generated in nuclear power plants.There are a few wind farms and geothermal(地?zé)岬? plants as well,but by far we get electricity mainly by burning something.
In other words,those “zeroemissions” cars are likely coalburning cars.It’s just because the coal is burned somewhere else that it looks clean.It is not.It’s as if the California Greens are covering their eyes—“If I can’t see it,it’s not happening.” Gasoline is an incredibly efficient way to power a vehicle;a gallon of gas has a lot of energy in it.But when you take that gas(or another fuel) and first use it to make electricity,you waste a nice part of that energy,mostly in the form of wasted heat—at the generator,through the transmission(傳送) lines,etc.
A gallon of gas may propel your car 25 miles.But the electricity you get from that gallon of gas won’t get you nearly as far—so electric cars burn more fuel than gaspowered ones.If our electricity came mostly from nukes;or geothermal,or hydro,or solar,or wind,then an electric car truly would be clean.But for political,technical,and economic reasons,we don’t use much of those energy sources.
In addition,electric cars’ batteries which are poisonous for a long time will eventually end up in a landfill.And finally,when cars are the polluters,the pollution is spread across all the roads.When it’s a power plant,though,all the junk is in one place.Nature is very good at cleaning up when things are too concentrated,but it takes a lot longer when all the garbage is in one spot.
【小題1】What does the underlined part mean in Paragraph 2?
A.People see the California Greens everywhere. |
B.People in California love to talk about zeroemissions vehicles. |
C.People in California love to have their roofs covered with solar cells. |
D.People in California have no idea that so far electricity mainly comes from burning coal,oil,etc. |
A.Electric cars are not clean at all. |
B.Electric cars are better than gasolinepowered ones. |
C.People cast doubts on electric cars’ batteries. |
D.Gasoline is an efficient way to power a vehicle. |
A.not less than 25 miles |
B.a(chǎn)s far as 50 miles |
C.a(chǎn)s far as 25 miles |
D.not more than 25 miles |
A.being green is good and should be encouraged in communication |
B.electric cars are not clean in that we get electricity mainly by burning something |
C.zeroemissions vehicles should be chosen to protect our environment |
D.electric cars are now the dominant vehicle compared with gasolinepowered cousins |
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科目:高中英語 來源: 題型:閱讀理解
Most people know precious gemstones (寶石) by their appearances. An emerald flashes deep green, a ruby seems to hold a red fire inside, and a diamond shines like a star. It’s more difficult to tell where the gem was mined, since a diamond from Australia or Arkansas may appear the same to one from the Democratic Republic of the Congo. However, recently, a team of scientists has found a way to identify a gemstone’s origin.
Beneath the surface of a gemstone, on the tiny level of atoms and molecules(分子), lie clues (線索) to its origin. At this year’s meeting of the Geological Society of America in Minneapolis, Catherine McManus reported on a technique that uses lasers (激光) to clarify these clues and identify a stone’s homeland. McManus directs scientific research at Materialytics, in Killeen, Texas. The company is developing the technique. “With enough data, we could identify which country, which mining place, even the individual mine a gemstone comes from,” McManus told Science News.
Some gemstones, including many diamonds, come from war-torn countries. Sales of those “blood minerals” may encourage violent civil wars where innocent people are injured or killed. In an effort to reduce the trade in blood minerals, the U.S. government passed law in July 2010 that requires companies that sell gemstones to determine the origins of their stones.
To figure out where gemstones come from, McManus and her team focus a powerful laser on a small sample of the gemstone. The technique is called laser-induced breakdown spectroscopy. Just as heat can turn ice into water or water into steam, energy from the laser changes the state of matter of the stone. The laser changes a miniscule part of the gemstone into plasma, a gas state of matter in which tiny particles(微粒)called electrons separate from atoms.
The plasma, which is superhot, produces a light pattern. (The science of analyzing this kind of light pattern is called spectroscopy.) Different elements(元素)produce different patterns, but McManus and her team say that gemstones from the same area produce similar patterns. Materialytics has already collected patterns from thousands of gemstones, including more than 200 from diamonds. They can compare the light pattern from an unknown gemstone to patterns they do know and look for a match. The light pattern acts like a signature, telling the researchers the origin of the gemstone.
In a small test, the laser technique correctly identified the origins of 95 out of every 100 diamonds. For gemstones like emeralds and rubies, the technique proved successful for 98 out of every 100 stones. The scientists need to collect and analyze more samples, including those from war-torn countries, before the tool is ready for commercial use.
Scientists like Barbara Dutrow, a mineralogist from Louisiana State University in Baton Rouge, find the technique exciting. “This is a basic new tool that could provide a better fingerprint of a material from a particular locality,” she told Science News.
【小題1】We learn from Paragraph 1 that __________________.
A.a(chǎn)n emerald and a ruby are names of diamonds. |
B.it’s not difficult to tell where the gem was mined. |
C.a(chǎn)ppearances help to identify the origin of gemstones. |
D.diamonds from different places may appear the same. |
A.To look for more gemstones. |
B.To encourage violent civil wars. |
C.To reduce the trade in blood minerals. |
D.To develop the economy. |
A.Heat can turn ice into water or water into steam. |
B.Gemstones from the same area produce similar light patterns. |
C.Laser can changes a miniscule part of the gemstone into plasma. |
D.Materialytics has already collected patterns from thousands of gemstones. |
A.It is ready for commercial use. |
B.People can use the new tool to find more gemstones. |
C.It can significantly reduce the gemstones trade in blood minerals. |
D.It will bring about a revolutionary change in identifying the origin of minerals. |
A.tell us how to identify the origin of diamonds. |
B.introduce a laser technique in identifying a stone’s origin |
C.prove identifying the origin of gemstones are difficult |
D.a(chǎn)ttract our attention to reducing trade in blood minerals |
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科目:高中英語 來源: 題型:閱讀理解
Humans have sewn by hand for thousands of years. It was said that the first thread was made from animal muscle and sinew (腱). And the earliest needles were made from bones. Since those early days, many people have been involved in the process of developing a machine that could do the same thing more quickly and with greater efficiency.
Charles Wiesenthal, who was born in Germany, designed and received a patent on a double-pointed needle that eliminated the need to turn the needle around with each stitch (縫合) in England in 1755. Other inventors of that time tried to develop a functional sewing machine, but each design had at least one serious imperfection. [來源:學(xué),科Frenchman Barthelemy Thimonnier finally engineered a machine that really worked. However, he was nearly killed by a group of angry tailors when they burned down his garment factory. They feared that they would lose their jobs to the machine.
American inventor Elias Howe, born on July 9, 1819, was awarded a patent for a method of sewing that used thread from two different sources. Howe’s machine had a needle with an eye at the point, and it used the two threads to make a special stitch called a lockstitch. However, Howe faced difficulty in finding buyers for his machines in America. In frustration, he traveled to England to try to sell his invention there. When he finally returned home, he found that dozens of manufacturers were adapting his discovery for use in their own sewing machines.
Isaac Singer, another American inventor, was also a manufacturer who made improvements to the design of sewing machines. He invented an up-and-down-motion mechanism that replaced the side-to-side machines. He also developed a foot treadle(腳踏板) to power his machine. This improvement left the sewer’s hands free. Undoubtedly, it was a huge improvement of the hand-cranked machine of the past. Soon the Singer sewing machine achieved more fame than the others for it was more practical, it could be adapted to home use and it could be bought on hire-purchase. The Singer sewing machine became the first home appliance, and the Singer company became one of the first American multinationals.
However, Singer used the same method to create a lockstitch that Howe had already patented. As a result, Howe accused him of patent infringement(侵犯). Of course, Elias Howe won the court case, and Singer was ordered to pay Howe royalties(版稅). In the end, Howe became a millionaire, not by manufacturing the sewing machine, but by receiving royalty payments for his invention.
【小題1】Barthelemy Thimonnier’s garment factory was burned down because _____________.
A.people did not know how to put out the fire |
B.Elias Howe thought Thimonnier had stolen his invention |
C.the sewing machines was couldn’t work finally |
D.workers who feared the loss of their jobs to a machine set fire |
A.Singer is an American inventor and manufacturer. |
B.The Singer sewing company became more practical. |
C.The foot treadle helped to make the sewer’s hands free. |
D.Singer made improvements to the design of sewing machines. |
A.Because the judge was against Singer for his surly attitude. |
B.Because Howe had already patented the lockstitch used by Singer. |
C.Because Singer had borrowed money from Howe and never repaid it. |
D.Because Singer and Howe had both invented the same machine. |
A.A Stitch in Time Saves Nine |
B.The Case between Howe and Singer |
C.Patent Laws on the Sewing Machine |
D.The Early History of the Sewing Machine |
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科目:高中英語 來源: 題型:閱讀理解
It's a fact that we all dream. Some dreams seem to last for hours, others only for seconds. Some of us have strange dreams, some have interesting dreams, and some of us have unpleasant dreams. Tests in the 1980s showed that these dreams occur within 90-minute cycles, each cycle made up of six stages. In the last stage people experience rapid eye movement, known as REM, and it is in this stage that dreaming takes place. Eighty percent of people who were woken during this sixth stage could easily remember their dreams. On the other hand, when during the first five stages (NREM), only seven percent could describe a dream.
However, of these same people woken during the first five stages, 74% were able to remember thinking activity, although they would not call it a dream. NerysDee, who has written about dreams in a book called "Your Dreams and What They Mean" says: "Perhaps during NREM sleep we are sorting out our outer mundane problems, but in REM sleep we are dealing with inside matters." She also makes the following statement about 90-minute cycle: It may also prove the reason why insomniacs who wake in the middle of the night find it impossible to get to sleep again for at least an hour and a half. In other words, until they have missed out one complete 90-minute sleep period.
【小題1】Which of the following statements about dreams is TRUE?
A.Everyone dreams but very few can recall what they dream. |
B.Some people have long dreams and others have very short ones. |
C.People can only remember unpleasant dreams. |
D.More than eighty percent of people can remember their dreams. |
A.between each 90-minute cycle |
B.a(chǎn)t any time during 90-minute cycles |
C.during the first five stages of 90-minute cycles |
D.in the last stage of 90-minute cycles |
A.hardly remember their dreams |
B.easily remember their dreams |
C.only remember their dreams |
D.partly remember their thinking activity |
A.can always remember their dreams |
B.have trouble getting into sleep at night |
C.experience rapid eye movement |
D.usually wake after each 90-minute sleep period |
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科目:高中英語 來源: 題型:閱讀理解
Expensive and new gloves allow chatterboxes(話匣子)to take the term “handsfree” to a new level—by talking into them as they make a call. The gloves are known as “Talk to the Hand” and cost £1,000 a pair. They fixed a speaker unit into the thumb and a microphone into the little finger that can be connected to any mobile handset using Bluetooth.
Artist Sean Miles designed the new gloves that double as a phone in part of his project that shows the possibilities of gadget(小配件) recycling. He uses outdated gloves and combines them with parts from mobile handsets recycled through O2, which commissioned(承擔(dān))the project. Mobile phone users will be able to keep their hands warm while they chat without taking their phones out of their pockets or handbags.
Mr Miles designed two pairs of the new gloves—one in pink and the other in brown and yellow. They will appear in an exhibition this July and visitors will be able to win the gloves. If demand is high, they will then be produced on a larger scale. O2 Recycle, which backed the project, estimates that there are already 70 million unused mobile handsets in the UK. The service pays up to £260 to those who recycle gadgets including phones, handheld consoles, MP3 players and digital cameras.
Designer Sean Miles hopes his work will get people thinking about recycling. The 41-year-old said, “I hope that my ‘Talk to the Hand’ project will get people to think again about the waste created by not recycling gadgets. If a few more people recycle their gadgets rather than send them to trash, I think this project will have fulfilled its aim.”
Bill Eyres, head of O2 Recycle, urges people to recycle their phone responsibly. He said, “There’s a pressing need for all of us to look at outdated handsets, and all the gadgets that we move on from or upgrade each year. Whether they are consoles or cameras, we should think of them as a resource that we need to recycle responsibly rather than throw them away.”
【小題1】The underlined word “O2” in Paragraph 2 is probably the name of ______.
A.a(chǎn)n artist | B.a(chǎn) company | C.a(chǎn) mobile | D.a(chǎn)n exhibition |
A.in the exhibition | B.from Mr Miles |
C.when they are mass produced | D.a(chǎn)fter they recycle the gadgets |
A.promote the technology of IT |
B.enable people to talk to their hands |
C.raise people’s awareness of recycling |
D.a(chǎn)ttract visitors’ attention in the exhibition |
A.New mobiles that are fashionable. |
B.Outdated handsets that are upgraded. |
C.Outdated gadgets that can be used for recycling. |
D.New gloves that can be used for making phone calls. |
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科目:高中英語 來源: 題型:閱讀理解
Do you like seahorses? What do you know about them?
The seahorse is actually not a horse but a fish, and much smaller than any regular horse. In general, a seahorse is about an inch long. It is a beautiful fish that likes warm waters, swims upright (直立的), and looks a little like a chess piece.
Seahorses are an unusual kind of animal because the males (雄性) give birth to babies. Mating (交配) takes place in cooler waters on spring and summer nights with a full moon. The females (雌性) put their eggs into the bodies of the males, and the males give birth to baby seahorses.
The seahorse can use each eye separately, which allows it to search for food without moving the rest of its body. Seahorses situate themselves near deep, fast-running channels rich in plankton, a kind of life on which they feed. They can catch food from an inch and a half away. Seahorses can change from gray or black to yellow or purple within seconds to fit in with their surroundings, and in this way escape from most of their enemies.
One of the surprising facts about seahorses for most people is that they are vertebrates (脊椎動(dòng)物). They can turn and curl freely, and like to swim in pairs connected by their tails. Their tails are powerful, and they can use them to grasp the surrounding seaweed (海藻) to keep themselves from being swept away. So seahorses are usually found in warm water filled with seaweed.
Now that you know all these facts about seahorses, don’t you find them more interesting?
【小題1】We can learn from the passage that seahorses _______.
A.a(chǎn)re beautiful, and live on seaweed |
B.a(chǎn)re as big as regular horses |
C.live near deep channels |
D.like to be alone |
A.male seahorses lay eggs |
B.seahorses mate in spring or autumn |
C.male seahorses give birth to babies |
D.seahorses mate in warmer waters at night |
A.Their fast speed of swimming. |
B.Their ability to change colours. |
C.Their unique eyes. |
D.Their strong tails. |
A.Eat. | B.Hold. | C.Make. | D.Handle. |
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科目:高中英語 來源: 題型:閱讀理解
New research has revealed that which song drivers listen to can influence how safe they are on the roads.Among the top ten safest songs to drive to are Come Away With Me by Norah Jones,I Don't Want to Miss a Thing by Aerosmith and Tiny Dancer by Elton John.Each of the songs has an optimum tempo(最佳節(jié)奏) for safe driving,imitating the human heartbeat at around 60 to 80 beats per minute.The Scientist by Coldplay and Justin Timberlake's Cry Me a River also appeared in the top 10.
The study,conducted at London Metropolitan University,also revealed the type of songs that cause motorists to drive dangerously.Unsurprisingly,music that is noisy increases a driver's heart rate,which can be deadly.Fast beats cause excitement that can lead people to concentrate more on the music than on the road and to speed up to match the beat of the song.Styles of music were also measured during the experiment and revealed differences between male and female drivers.Hiphop made a female driver drive far more aggressively,speeding up faster than male driver.The heavy metal music caused the fastest driving among males in the group while the dance music had the same effect among women.The male and female drivers who listened to the classical music drove the most irregularly.
The experiment involved eight people driving 500 miles each using the confused.com MotorMate app,which monitored driving behaviors through GPS technology.
【小題1】What's the main idea of the whole passage?
A.Songs that drivers prefer to listen to on their way. |
B.A study made by the confused.com MotorMate app. |
C.What kind of songs the drivers should choose to listen to during driving. |
D.Female drivers and male drives have different responses to the same music. |
A.controlled | B.banned | C.modeled | D.showed |
A.Tiny Dancer by Elton John appeared in the top 10. |
B.Usually human hearts beat at around 60 to 80 beats per minute. |
C.The classical music makes most drivers drive comfortably and safely. |
D.The passage reveals appropriate music and improper music for drivers. |
A.female and male drivers' popular tastes of music |
B.how did the study carry out |
C.why fast beat music is harmful to drivers |
D.some music with optimum tempo for driver to enjoy |
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科目:高中英語 來源: 題型:閱讀理解
It doesn’t kill germs better than cooler water, but turning tap temperatures high, the US burns carbon equal to the emissions of Barbados.
People typically wash their hands seven times a day in the United States, but they do it at a far higher temperature than is necessary to kill germs, a new study says. The energy waste is equivalent to the fuel use of a small country.
It’s cold and flu season, when many people are concerned about avoiding germs. But forget what you think you know about hand washing, say researchers at Vanderbilt University. Chances are good that how you clean up is not helping you stay healthy; it is helping to make the planet sick.
Amanda R. Carrico, a research assistant professor at the Vanderbilt Institute for Energy and Environment in Tennessee, told National Geographic that hand washing is often “a case where people act in ways that they think are in their best interest, but they in fact have inaccurate beliefs or outdated perceptions.”
Carrico said, “It’s certainly true that heat kills bacteria, but if you were going to use hot water to kill them it would have to be way too hot for you to tolerate.”
She explained that boiling water, 212°F (99.98°C), is sometimes used to kill germs - for example, to clean drinking water that might be polluted with germs. But “hot” water for hand washing is generally within 104°F to 131°F (40°C to 55°C.) At the high end of that range, heat could kill some germs, but the sustained contact that would be required would scald the skin.
Carrico said that after a review of the scientific literature, her team found “no evidence that using hot water that a person could stand would have any benefit in killing bacteria.” Even water as cold as 40°F (4.4°C) appeared to reduce bacteria as well as hotter water, if hands were scrubbed, rinsed(沖洗)and dried properly.
In fact, she noted that hot water can often have an unfavorable effect on hygiene. “Warmer water can harm the skin and affect the protective layer on the outside, which can cause it to be less resistant to bacteria,” said Carrico.
Using hot water to wash hands is therefore unnecessary, as well as wasteful, Carrico said, particularly when it comes to the environment. According to her research, people use warm or hot water 64 percent of the time when they wash their hands. Using that number, Carrico’s team calculated a significant impact on the planet.
“Although the choice of water temperature during a single hand wash may appear minor, when multiplied by the nearly 800 billion hand washes performed by Americans each year, this practice results in more than 6 million metric tons of CO2 equivalent emissions annually,” she said.
That’s roughly equal to the emissions of two coal-fired power plants, or 1,250,000 passenger vehicles, over the course of a year. It’s higher than the greenhouse gas emissions of small countries like El Salvador or Armenia, and is about equivalent to the emissions of Barbados. If all US citizens washed their hands in cooler water, it would be like eliminating the energy-related carbon emissions of 299,700 US homes, or the total annual emissions from the US zinc or lead industries.
The researchers found that close to 70 percent of respondents said they believe that using hot water is more effective than warm, room temperature, or cold water, despite a lack of evidence backing that up, said Carrico. Her study noted research that showed a “strong cognitive(認(rèn)知的) connection” between water temperature and hygiene in both the United States and Western Europe, compared to other countries, like Japan, where hot water is associated more with comfort than with health.
The researchers published their results in the July 2013 issue of International Journal of Consumer Studies. They recommended washing with water that is at a “comfortable” temperature, which they noted may be warmer in cold months and cooler in hot ones.
【小題1】What does the writer mainly focus on when writing this passage?
A.Whether hot water helps kill germs effectively in hand washing. |
B.How hot water contributes to the serious worsening of our planet. |
C.Why the consumption of hot water is unnecessary and wasteful. |
D.What the advantages and disadvantages of using hot water are. |
A.burn | B.improve | C.soften | D.wrinkle |
A.two coal-fired power plants | B.US zinc or lead industries |
C.1,250,000 passenger vehicles | D.El Salvador or Armenia |
A.Universal Science Fiction | B.Science & Discoveries |
C.Environment & Protection | D.Exploration of America |
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