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Why did one scientist expose birds to artificial daylight?A.To test the relationship betwe

en daylight and a disease of the glands common to birds.B.To test the relationship between daylight and migration.C.To test the relationship between migration and temperature.D.To test the relationship between daylight and changes in the season.

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更多“Why did one scientist expose b…”相关的问题
第1题
Why did the professor study the Brazilian students' behavior? A. He felt puzzled

Why did the professor study the Brazilian students' behavior?

A. He felt puzzled at the students' being late.

B. He felt angry at the students' rudeness.

C. He wanted to make the students come on time later.

D. He wanted to collect data for one of his studies.

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第2题
Why do people shrink? Did you ever see the movie Honey,I shrunk the kids? It’s about a

Why do people shrink?

Did you ever see the movie Honey,I shrunk the kids? It’s about a wacky dad(who’s also a scientist)wh0 accidentally shrinks his kids with his homemade miniaturizing invention.0ops! ____(1).

For older people,shrinking isn’t that dramatic or sudden at all. It takes place over years and may add up to only one inch or so off of their adult height(maybe a 1ittle more,maybe less), and this kind of shrinking can’t be magically reversed,although there are things that can be done to stop it or slow it down._____(2).

There are a flew reasons.As people get older,they generally lose some muscle and flat from their bodies as part of the natural aging process.Gravity (the force that keeps your feet on the ground) take hold,and the bones in the spine,called vertebrae,may break down or degenerate,and start to collapse into one another_____ (3).But perhaps the most common reason why some older people shrink is because

of osteoporosis.

0steoporosis occurs when too much spongy bone tissue(which is found inside of most bones)is broken down and not enough new bone material is made.______(4). Bones become smaller and weaker and can easily break if someone with osteoporosis is injured. Older people—especially women,who generally have smaller and lighter bones to begin with--are more likely to develop osteoporosis.As years go by,a person with osteoporosis shrinks a little bit.

Did you know that every day you do a shrinking act? You aren’t as tall at the end of the day as you are at the beginning.That’s because as the day goes on,water in the disks of the spine gets compressed(squeezed)due to gravity,making you just a tiny bit shorter.Don’t worry,though._____(5)

A.They end up pressing closer together,which makes a person lose a little height and become shorter.

B.0rice you get a good night’s rest,your body recovers,and the next morning,you’re standing tall again. C.0ver time.bone is said to be lost because it’s not being replaced.

D.Luckily,there are things that people cab do to prevent shrinking.

E.The kids spend the rest of the movie as tiny people who are barely Visible while trying to get back to their normal size.

F.But why does shrinking happen at all ?

第 21 题 请选择(1)处的最佳答案.

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第3题
Mrs. Andrews had a young cat and it was the cats frst winter One evening the cat was outide when it began to snow heavilyMsAndrews loked everywhere and shouted its name, but she did not find i so she telephoned the police and said, "Thave lost a smallblack cat. Has anybody found one?"

"No, Madam," said the policeman at the other end, "But the cats are really very strong animals. They sometimes live for days in the snow, and when somebody finds them, they are quite all right."

Mrs.Andrews felt happier when she heard this, "And," she said, "our cat is very clever. She almost talks."

The policeman was getting tired. "Well then," he said, "why don't you put your telephone down? Perhapssheis trying to telephone you now."

21、MisAndter hdacata wa es hanyerod

A. True

0 B. False

22、The cat was at home when it began to snow heavly

A. True

B. False

23、The story happened on a spring morning.

O A. Trwy

B. False

24、The underlined word "she" in the last sentence refers to thecat.

A. False

B. True

25、The policeman was getting rather tired becauseMrs Andrews had talked too much to him on the phone.

A. False

B. True

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第4题
Long, long ago there was a very foolish thief. Do you know what he did one day? When h
e wanted to steal(偷) the bell on his neighbour's door, he walked up to the door, took hold of (抓住) the bell and pulled hard. The bell made a very loud noise. The thief was afraid and went home.Then he sat down to think, "I must do something about the noise," he said. He thought and thought. At last he had an idea. "Ah, I'll put some cotton in my ears. Then I won't be able to hear the noise." The next day he went to the door of his neighbour, and took hold of the bell. This time he pulled even harder. The bell rang loudly, but the thief did not hear anything. With another hard pull he got the bell out. Just then the neighbour came running out."Steal my bell? I'll teach you a lesson (教训), "the angry man shouted. And he hit the thief on the nose. The foolish thief did not know how the neighbour found out he was stealing the bell. "Why did he come out just then?" he wondered (感到疑惑).

1. The thief was trying to get his neighbor's doobell. ()

2.The thiet put some cotton in his ears so as not to hear anything()

3. The neighbor ran out probably because he knew his doorbell was being stolen. ()

4.The neighbor hit the thief to punish him for stealing. ()

5. The thief thought the neighbor couldn't hear the noise of the bell. ()

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第5题
Richard lived with his mother when he was young. He didn't know who his father was. The wo
man did some washing for the rich and could buy only some bread for her son. So the boy was short and thin.

One cold morning there was much snow in the streets. A truck hit the woman and the policemen took her to the hospital. Dying (临死) , she said to her son, "Your father forsook (抛弃) me before you were born. It's his name and address."

Richard found his father, Mr. Cook, in. another city. It was one of the richest shopkeepers and he had to receive his son. From then on the boy lived a happy life. He ate all kinds of delicious food and wore beautiful clothes. But people often laughed at his rudeness (粗鲁).

Once his father took him to a party. He saw a newspaper lying on the floor and picked it up while others were talking about a film. He had a look at it and found a car's wheels were upward (向上). He called out," Oh, dear ! An accident happened !"

All the people were surprised and began to read the newspaper. But soon they all began to laugh. Do you know why?

Richard didn't know his father because ______.

A.the man was very rich

B.the man forsook his mother

C.his mother left the man

D.the man didn't like him

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第6题
We can make mistakes at any age. Some mistakes we make are about money. But most mistakes
are about people. "Did Jerry really care when I broke up with Helen? .... When I got that great job, did Jim really feel good about it, as a friend? Or did he envy my luck?" When we look back, doubts like these can make us feel bad. But when we look back, it' s too late.

Why do we go wrong about our friends or our enemies? Sometimes what people say hides their real meaning. And if we don' t really listen closely we miss the feeling behind the words. Suppose someone tells you, "You' re a lucky dog." That' s being friendly. But "lucky dog?" There' s a bit of envy in those words. Maybe he doesn' t see it himself. But bringing in the "dog" puts you down a little. What he may be saying is that he doesn' t think you deserve your luck.

"Just think of all the things you have to be thankful for is another noise that says one thing and means another. It could mean that the speaker is trying to get you to see your problem as part of your life as a whole. But is he? Wrapped up in this phrase is the thought that your problem isn' t important. It' s telling you to think of all the starving people in the world when you haven't got a date for Saturday night.

How can you tell the real meaning behind someone' s words? One way is to take a good look at the person talking. Do his words fit the way he looks? Does what he says agree with the tone of voice? His posture? The look in his eyes? Stop and think. The minute you spend thinking about the real meaning of what people say to you may save another mistake.

This passage is mainly about ______.

A.how to interpret what people say

B.what to do when. you listen to others talking

C.how to avoid mistakes when you communicate with people

D.why we go wrong with people sometimes

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第7题
Tens of thousands of 18-year-olds will graduate this year and be handed meaningless diplom
as. These diplomas won't look any different from those awarded their luckier classmates. Their validity will be questioned only when their employers discover that these graduates are semiliterate(半文盲).

Eventually a fortunate few will find their way into educational-repair shops—adult-literacy programs, such as the one where I teach basic grammar and writing. There, high-school graduates and high-school dropouts pursuing graduate-equivalency certificates will learn the skills they should have learned in school. They will also discover they have been cheated by our educational system.

I will never forget a teacher who got the attention of one of my children by revealing the trump card of failure. Our youngest, a world-class charmer, did little to develop his intellectual talents but always got by. Until Mrs. Stifter.

Our son was a high-school senior when he had her for English. "He sits in the back of the room talking to his friends," she told me. "Why don't you move him to the front row?" I urged, believing the embarrassment would get him to settle down. Mrs. Stifter said, "I don't move seniors. I flunk(使…不及格) them." Our son's academic life flashed before my eyes. No teacher had ever threatened him. By the time I got home I was feeling pretty good about this. It was a radical approach for these times, but, well, why not? "She's going to flunk you," I told my son. I did not discuss it any further. Suddenly English became a priority(头等要事) in his life. He finished out the semester with an A.

I know one example doesn't make a case, but at night I see a parade of students who are angry for having been passed along until they could no longer even pretend to keep up. Of average intelligence or better, they eventually quit school, concluding they were too dumb to finish. "I should have been held back," is a comment I hear frequently. Even sadder are those students who are high-school graduates who say to me after a few weeks of class, "I don't know how I ever got a high-school diploma."

Passing students who have not mastered the work cheats them and the employers who expect graduates to have basic skills. We excuse this dishonest behavior. by saying kids can't learn if they come from terrible environments. No one seems to stop to think that most kids don't put school first on their list unless they perceive something is at risk. They'd rather be sailing.

Many students I see at night have decided to make education a priority. They are motivated by the desire for a better job or the need to hang on to the one they've got. They have a healthy fear of failure.

People of all ages can rise above their problems, but they need to have a reason to do so. Young people generally don't have the maturity to value education in the same way my adult students value it. But fear of failure can motivate both.

What is the subject of this essay?

A.view point on learning

B.a qualified teacher

C.the importance of examination

D.the generation gap

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第8题
It was Monday, Mrs. Smith's dog was hungry, but there was not any meat in the house.Consid

It was Monday, Mrs. Smith's dog was hungry, but there was not any meat in the house.

Considering that there was no better way, Mrs. Smith took a piece of paper, and wrote the following words on it, "Give my dog half a pound of meat." Then she gave the paper to her dog and said gently, "Take this to the butcher (卖肉者) , and he's going to give you your lunch today."

Holding the piece of paper in its mouth, the dog ran to the butcher's shop. It gave the paper to the butcher. The butcher read it carefully, recognized that it was really the lady's handwriting and presently did as he was asked to. The dog was very happy, and ate the meat up immediately.

At midday (正午), the dog came to the shop again. It gave the butcher a piece of paper again. After reading it, he gave it half a pound of meat once more.

The next day, the dog came again exactly at midday. And as usual it brought a piece of paper in. the mouth. This time, the butcher did not take a look at the paper, and gave the dog its meat, for he had regarded the dog as one of his customers.

But, the dog came again at four o'clock. And the same thing happened once again. To the butcher's more surprise, it came for the third time at six o'clock, and brought with it a third piece of paper. The butcher felt a bit puzzled. He said to himself, "This is a small dog. Why does Mrs. Smith give it so much meat to eat today?"

Looking at the piece' of paper, he found that there were not any words on it!

Mrs. Smith treated her little dog quite ______.

A.cruelly

B.kindly

C.badly

D.unfairly

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第9题
Charlene, a 16-year-old student at a high school, found herself faced with a maths test to
which she knew none of the answers.Rather than fail, she took the test out with her and filled in the answer swith the help of her friends. During a break, shegot back into the classroom without being seen, crumpled the test with her shoe, and left it lying on the floor. The teacherthought it hadbeen drop pedwhen the testswere collected; shecorrected it, and Charlene received a B.

Cheating is, of course, nothing new. But today,educators are finding that cheating on the part of students hasbecome more frequent than in the past. Whether it is copying a friend&39;s homework, using a preparedsheeton an exam, stealing advance copies of a final, writing down rules in one’s hand, or paying someone else to write a term paper, cheating appearsto have gained acceptance among agrowing number of studentsbetween 13 and 19.

In a 1978 study of cheating at twenty-two high schools in Georgia, it was found that cheating was common among good and poor students alike — although both boys and girls said they thought boys cheatedmore.

Why is student cheating on the rise? No one really knows. Some blame cheating on a general loss of good values among today&39;s youth. They point to facts showing increaseddamageof public thin gs and school stealing and think that reports, such as Watergate have disappointed youth about the honesty of people in higher positions.

Others think that today&39;s youth are far more practical than their forefathers. In the late sixties and e arly seventies, students were filled with imaginations about changing the world, but today&39;s students feel great stressto succeed.

According to Paragraph1, Charlene took the test out because_____ .

A.her friends could answer none of the problems

B.she tore the testpaper to pieces

C.she stepped her shoeson the test paper

D.she did not want to fail in the math test

Charlene passedthe test because_____ .A.sheansweredall the questions by herself

B.shedid the test by cheating

C.shepersuadedher teacherto give her a B

D.shereturned to the classroom to redo the test

Which of the following is not an example to show that cheating is becoming more and more common?A.A student pays another for doing a test paper.

B.A student writes down something to be testedbefore anexam.

C.A student getswell preparedin his studiesbefore an exam.

D.A student getshomework from his classmateandthen copies it.

The 1978 study of cheating in Georgia shows that ______.A.only studentsin the 24 high schools cheatedin examinations

B.both good and poor studentscheatedin examinations

C.boys liked cheating while girls did not like it

D.more girls cheatedin examinations than boys did

One of the facts for the rise of cheating is that _____.A.more and more public things are damaged

B.good values disappoint students

C.more and more students begin to steal

D.honestpeople are in higher positions

请帮忙给出每个问题的正确答案和分析,谢谢!

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第10题
Life on MarsPerhaps more than anything else, scientists are eager to find out if Martian l

Life on Mars

Perhaps more than anything else, scientists are eager to find out if Martian life existed in the past—or still exists.【61】telescopes first zoomed in【62】Mars in the 17th century, people have conjured up a wild【63】of images or what Martians might look like. But space probes like the 1997 Sojourner land rover have yielded no evidence of such alien beings.

Most experts agree that if life did at one time evolve on Mars, finding evidence of that life—which would likely take the form. of tiny organisms—won't be easy.【64】, many scientists are optimistic. "We've got organisms on Earth that adapted to life deep【65】the surface in underground water wells, " says Stephen Clifford. "【66】life like that evolved on Mars four billion years ago, there's no reason why it【67】today. "

【68】last year's disappointing losses, the future of Martian exploration looks【69】This year, two major

films about fictitious Mars missions—Red Planet and Missions to Mars—are certain to heighten interest in our planetary neighbour. More important, plans for new sets of NASA orbiters and landers—one to launch in 2001 , the other in 2003—are already in the works. Without a doubt, each new mission will inch scientists closer to【70】the mysteries of planet Mars.

(61)

A.When

B.Before

C.Ever since

D.Ever

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