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  Microwaves may be great at warming up food, but what about warming people?
Using microwaves to directly heat owners of a room would save much of the energy wasted by heating walls and furniture. And despite popular ideas about microwaves, this technique would be safe, according to Charles R. Buffler of the Microwave Research Center in Marlborough, New Hampshire. Low-power microwaves only penetrate (贯穿) the skin (low-power microwave penetration in a ham is about 0.2 inches, for example) and with no negative effects.
To test this idea, Buffler subjected himself to microwaves in a special room using a standard 500-watt, 2459 MHz magnetron (磁控管). He found that a person will start to feel warmth at about 20 milliwatts per square centimeter (mw. /sq.cm.); a satisfactory feeling of warmth occurs between 35 and 50 mw./sq.cm. By comparison, a person standing in noonday summer sun feels the amount of 85 mw./sq.cm. And a frozen meat pie in your microwave oven receives about 1000 mw./sq. cm.
In houses of the future, each room could be provided with its own magnetron, says Buffler. When you stepped into the living room, for example, a motion detector would turn on the magnetron, filling the room with low-power microwaves. In the same way that a microwaves oven heats up a hamburger, but not the plate it’s on, you would feel warmth from the microwaves without changing the temperature of your coffee table. (You could, however, make your favorite easy chair even more comfortable by treating it with a radiation-absorbing chemical.)
While it might be some time before homeowners are comfortable enough with the idea to set up whole body microwave heaters in houses, Buffler says microwaves may attract livestock farmers. Lambs that are born outdoors in winter, for example, are frequently lost to cold. Microwaves could warm the lambs safely and quickly.
小题1: Which of the following can tell the main idea of the passage?
A.A new heating system. B.A new microwave oven.
C.A popular technique.D.The magnetron.
小题2: The test conducted by Buffler shows that when a person feels comfortable warmth, he receives about ____.
A.20 mw. / sq. cm.B.40 mw. / sq. cm.
C.60 mw. / sq. cm.D.85 mw. / sq. cm.
小题3: According to paragraph 4, which of the following fills the room with low-power microwaves?
A.The magnetron.B.The motion detector.
C.The microwave oven.D.The radiation-absorbing chemical.
小题4: Which of the following statements about microwave heaters would Buffler most probably agree with?
A.Microwave heaters will soon be widely used by homeowners.
B.Microwave heaters sometimes make people feel uncomfortable.
C.Microwave heaters will be probably first used by livestock farmers to protect their lambs in winter.
D.Microwave heaters cannot be accepted by the public because they are somewhat unsafe.

答案
小题1:A小题1:B小题1:A小题1:C
解析

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试题【  Microwaves may be great at warming up food, but what about warming people? Usi】;主要考察你对题材分类等知识点的理解。[详细]
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完形填空(共20小题;每小题1.5分,满分30分)
Some people who find themselves unable to solve a problem react by just giving up. But it is not good to  36  problems by giving up or make excuses for  37 . You may be sure that all young people  38  the same difficult process that you are going through: meeting new situations, developing new skills, and testing their abilities.
If you are unhappy about something, face it. Try to  39  the problem in a few words, so that you will know exactly what you are  40 . Then see if you can “put you finger” on the  41   of your unhappiness.
In many cases, we only “think” there is no  42  to a particular problem. But often we can  43  the problem and achieve the goal by making a direct  44 .
For example, a boy wanted to be a debater(辩论家). When he tried for the debating team as a  45  , the coach thought he was  46 . He was shy; he had a high-pitched voice and his posture(姿态) was poor. Although he was given little hope of success, he took  47  of every   48  to debate. He studied from successful speakers and  49  his own weakness and assets. Then he  50  many hours learning all the facts on the topics for the debate, and worked at developing good posture and at speaking clearly. In his junior year, he made the school  51   team, and in his senior year, he was on the winning team in his state. He  52  his goal because he had made a direct attack on his problem.
 53  direct attack is often the best way to face problems, we have to be  54  in judging situations and sometimes it is necessary to  55  the goal. So it is important to study the situation and make a wise decision about what to do.
小题1:
A.escapeB.noticeC.clear upD.dismiss
小题2:
A.successB.failureC.changeD.himself
小题3:
A.go throughB.experiencedC.escape fromD.give up
小题4:
A.sayB.stateC.findD.solve
小题5:
A.dealt withB.up toC.escapingD.up against
小题6:
A.causeB.purposeC.pointD.statement
小题7:
A.wayB.solutionC.methodD.hope
小题8:
A.give upB.think ofC.considerD.overcome
小题9:
A.attackB.methodC.changeD.catch
小题10:
A.directorB.instructorC.adviserD.freshman (新人)
小题11:
A.hopefulB.greatC.hopelessD.grateful
小题12:
A.useB.advantageC.valueD.effect
小题13:
A.minuteB.opportunityC.effortD.other
小题14:
A.sized upB.thought upC.made upD.gave in
小题15:
A.costB.foundC.spentD.wasted
小题16:
A.speakingB.successfulC.debatingD.member
小题17:
A.gave upB.escapedC.caughtD.achieved
小题18:
A.AlthoughB.SinceC.BecauseD.However
小题19:
A.falseB.realisticC.hopefulD.valuable
小题20:
A.give upB.changeC.attackD.strike

题型:不详难度:| 查看答案
Detectives often look for footprints when they try to solve crimes. Scientists use footprints, too—dinosaur footprints when they try to figure out how dinosaurs lived and moved.
Dinosaurs died out about 65 million years ago. Today scientists work to solve the mysteries of these ancient animals.
Footprints, or tracks(脚印), are an important way to learn about dinosaurs. Christian Meyer of the Natural History Museum in Basel, Switzerland, calls dinosaur tracks “the closest thing to a movie” of dinosaurs.
“They tell us something about the size of the animal, the way they were walking…they tell us something about their speed,” Meyer said.
Tracks also show that dinosaurs sometimes traveled in groups. Traveling in groups probably helped dinosaurs protect themselves from enemies. Plus, some meat-eating dinosaurs may have hunted in groups, much like wolves do today. Being in a group could help dinosaurs work together to kill large animals.
Dinosaur footprints can be as small as a few inches across, but they can also be as big as a few feet across. Dinosaur footprints have been found throughout the world at over 1,500 sites, including a T. Rex footprint in New Mexico. “Trackways” are groups of footprints.
And scientists aren’t the only ones finding dinosaur tracks—kids can, too! Eleven-year-old Mark Turner and nine-year-old Daniel Helm discovered dinosaur tracks in British Columbia, anada. Soon scientists began studying the tracks.
Scientists and other people interested in studying dinosaurs are working to save the trackways from activities like construction and mining.
小题1:The passage mainly tells us that_______.
A. there were really dinosaurs on the earth millions of years ago
B. dinosaurs were the most frightening animals in the past
C. dinosaur footprints are important in learning about dinosaurs
C. why dinosaurs died out millions of years ago
小题2:By studying footprints scientists can know the following EXCEPT _______.
A.how big the dinosaur wasB.what color the dinosaur was
C.how fast the dinosaur could runD.how the dinosaur walked
小题3: By working in groups, some meat-eating dinosaurs_______.
A.made the hunting of large animals easily
B.could travel a long way without being lost
C.could protect themselves from being hunted by wolves
D.could get to a place faster
小题4: From the last paragraph we can infer that some human activities like mining_______.
A.are helpful to the study of dinosaurs
B.can help scientists solve many mysteries
C.can lead to the discovery of the footprints
D.can destroy the footprints of the dinosaur

题型:不详难度:| 查看答案
You are walking down the street, minding your own business when you see a snowball. No big deal, right? Except the snowball is as tall as you are. And weighs about a ton. Did we mention that it is June?
That’s the experience thousand of Londoners had when they crossed paths with “ Snowball in Summer,” Goldsworthy makes sculpture (雕塑)from all sorts of things he finds outside – leaves, earth, and rocks, as well as ice and snow. He wanted to find out how busy people would react to an unexpected snowball melting in their midst.
During the winter of 2008, he rolled 13 giant snowballs near his home in Scotland. He filled each one with a surprise in the center – such as berries, feathers, little stones or sheep’s wool – which would appear as the snow melted. The finished snowballs were stored in a deep freeze until summer, then transported to London in refrigerated trucks. At midnight on June 21, 2008, while the city slept, Goldsworthy and his helpers rolled their snowballs into place.
People walking to work or school must have thought the sky was falling when they stumbled across snowballs the size of baby elephants. Some of them had never even seen snow in real life, and they couldn’t help touching them in great surprise. As the snow started to melt, things got even more interesting. The perfectly round snowballs took on different shapes as the stuff inside began to poke through. Two days later, most of Goldsworthy’s snowballs were gone, and their fillings scattered. But Londoners were left with a really good story about that odd summer day when the snowball came.
小题1:What is really special about the snowballs is that ______________________.
A.they lie in the street
B.they are in the shape of baby elephants.
C.they have berries, feathers, little stones and feathers in them.
D.they appear in June.
小题2: What was the purpose of Goldsworthy in making the snowballs?
A.To find out people’s reactions to them
B.To call up people’s memory of the cold winter.
C.To show off his skills in sculpture.
D.To let people experience the cold winter.
小题3: Why did Goldsworthy and his helpers roll their snowballs into place at mid-night?
A. They didn’t want to disturb other people.
B. It was quite at that time.
C. They wanted to avoid the traffic jam.
D, They wanted to give people a surprise.
题型:不详难度:| 查看答案
The holiday"s upon us. Finally, after months of study, you have some time to yourself. so, why not read a book? Well, some people will say, "Why bother with books? We have the Internet and other media that offer a lot more colorful entertainment. Books are history!" But don"t be fooled. There"s still a lot to be said for reading.
One clear reason is that a well-chosen book is a wonderful source of vocabulary, so long as you have a good dictionary, of course. Believe me, it"s far easier to get new English words and phrases from a book or article than it is from the TV or the Internet.
But an even more important point is that books give you something that modern media simply can not. The average webpage is picture-heavy and the text is often designed to make it as easy to read as possible. While "easy" may be attractive, unfortunately it"s little use for many long-term development of reading skills and the general language level. For that, there"s still no substitute (替代品)of a book.
But perhaps the best single reason is that simply choosing what you read and doing it independently means that it"s something you do by yourself. You can choose what you want to read. It"s hard work, but something down the line, you will find that what once seemed like a duty is now a pleasure. We asked three bookworms -- an English teacher, a book editor and a film critic - to pick some favorite reads for you.
小题1: How many reasons for reading a book does the author mention in the passage?
A.OneB.TwoC.ThreeD.Four
小题2: According to this passage, we basically need a ______ in reading.
A.computerB.dictionaryC.notebookD.pencil
小题3:In the author"s opinion, reading on the Internet may ________
A.develop long-term reading skillsB.improve the general language ability
C.not take the place of reading booksD.be an effective way of reading
小题4: The passage is written mainly to ____________.
A.share the pleasure of reading booksB.advise readers to read books
C.stress the importance of reading online.D.help readers to choose good books.

题型:不详难度:| 查看答案
How the Americans view love
An old song says that " love makes the world go around" If you watch Americans on Valentine"s Day, you can believe it. The whole country breaks out with little red hearts. Lovestruck people give cards, flowers and candy to their sweethearts.
The American concept of love and romance begins with dating. Young people date in several ways. At first they might have group dates with several boys and girls together. Later, they start going on single date - just one boy and one girl.
When two couples go out together, it"s called double dating. A friend might even arrange a blind date for you with someone you don"t know who your partner will be until the time of the date.
American young people see a date as a time just to have fun. They don"t always have a romantic interest in mind. Someone may go out with one person this week, and another the next. After a while, a boy and a girl may decide they want to go steady. This means they think of each other as boyfriend and girlfriend. It also means they don"t want to date anyone else. Romance is beginning to bloom.
Romance love is very much a part of American culture. Movies, TV shows and books in America all picture people falling in love. Actually, people all over the world search for happiness in a loving relationship. Maybe love does make the world go around.
小题1: How do you understand the understand sentence in the first paragraph?
A.Many young people"s hearts break in America that day.
B.You can see many pictures of little red hearts all over America that day.
C.People all over the world show their hearts to each other that day.
D.people go out with their warm hearts that day
小题2:How many kinds of dates are mentioned in the passage?
A.2B.3C.4D.5
小题3:What does blind date mean?
A.You can not see who is your partner during the date.
B.The partner of your date is a stranger.
C.Your date is arranged secretly.
D.You will not know your partner until the date begins.
小题4: Which of the following statement is true about American"s view of romantic?
A.Romance love is the most important thing in the world
B.People all over the world search for romance love
C.Date is one thing, romantic is another.
D.They can find their ideal love in movies, TV shows and books

题型:不详难度:| 查看答案
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