Not long before another scientist had found that uranium rays. [ ] A. gave away B. gave off C. gave in D. gave up 题目和参考答案——青夏教育精英家教网—

Why don’t birds get lost on their long migratory (迁移的) flights? Scientists tried their best to find the 1 to this question for many years. The reasons have been discovered only lately.

　　 2 ago experiments showed that birds depend on the sun to guide them 3 . But what about birds that fly mainly by night? 4 with man-made stars have 5 that certain night-flying birds are able to follow the 6 in their long distance flights.

　　One such 7 , a warbler (鸣禽), had spent its lifetime in a 8 and had never flown under a natural sky. Yet is showed its 9 by birth to use the stars for guidance. The bird's cage was put under a man-made star-filled sky at migration 10 . The bird tried to fly 11 the same direction as 12 taken by other birds in the building. Any 13 in the position of the make-believe (虚构的) stars 14 a change in the direction of its flight.

　　Scientists think that warblers, 15 flying in daylight, use the sun for guidance. But stars are clearly their important 16 of navigation(导航). What do they do when the stars are 17 behind the clouds? Clearly, they find their way by such land 18 as mountains, coastlines and river courses. But when it's too 19 to see these, the warblers circle 201 , unable to find out where they were.

1. A. reply B. answer C. discovery D. replies

2. A. Not long B. Long C. Centuries D. Years

3. A. during the night B. during daylight hours

C. in winter D. in the dark

4. A. Examinations B. Labs C. Tests D. In the dark

5. A. been proved B. found C. been found D. proved

6. A. stars B. moon C. route D. sun

7. A. star B. scientist C. bird D. flight

8. A. forest B. cage C. nest D. cave

9. A. strength B. ability C. experience D. practice

10. A. time B. place C. way D. season

11. A. to B. towards C. in D. under

12. A. that B. which C. one D. it

13. A. one B. change C. way D. bird

14. A. caused B. gave C. resulted D. meant

15. A. for B. when C. after D. they are

16. A. ways B. means C. objects D. homes

17. A. shown B. covered C. moved D. hidden

18. A. areas B. surface C. marks D. signs

19. A. far B. high C. dark D. bright

20. A. helplessly B. quickly C. easily D. freely

Not long ago , Richard Denniston found himself suffering the same pain that millions of other pet owners have faced . His little Scottish dog had a brain tumor（肿块）and would soon die. Like others who faced the problem before him , Denniston just wanted to end his pet’s suffering . However , he took one step further.

Deniston , an expert who studies animals , collected a tiny skin sample from the dog and took it to his laboratory at Louisiana State University. There he cultivated it and froze it in liquid nitrogen.

From that idea , Denniston started a new technology .Denniston’s company will save pet’s DNA ＄500，plus a monthly storage fee of Us ＄10, until cloning becomes a reality .

Thanks mostly to the contribution of a California multimillionaire , that day may not be so far off.

“It could happen extremely soon if everything went on well.”says Mark Westhusin , a professor leading a dog cloning team . Most experts put successful dog cloning a year to five years down the road . The cost is bound to be expensive at first , but it would eventually drop to a few thousand dollars.

Since Dolly , the sheep which was first cloned in 1997 ,cattle ,goats ,mice and monkeys have been cloned in labs . Pets are likely to be next.

“I really believe that the technology is going to become available for many species in the near future ,”Denniston says .

1. After his pet died ,Richard Denniston_______.

A. did something more than the ordinary pet owners

B. did as other pet owners

C. did nothing but feel very sad

D.could not help feeling lonely without his dear pet

2. Richard Denniston_________in liquid nitrogen for an experiment.

A. was a doctor who put his dog

B. was an animal expert who put a piece of his dog’s skin

C.was an expert at collecting skin samples who then put them

D.took great interest in freezing things

3. The underlined word “cultivated ”in Para . 2 probably means_________.

A. bought B.discovered C.caught D.trained

4. Cloning will cost people_______.

A. a lot of money in five years .

B. much in the beginning and then be reduced to a thousand dollars.

C. much and then will surely be reduced to thousands of dollars.

D.much at first and then might be reduced to a few thousand dollars.

　When several different people look at the same person, it is not unusual for each of them to see different things; when you alone observe one behavior or one person at two different times, you may see different things. The following are but some of the factors that lead to these varying perceptions (感知，认知)：

　　(1)Each person’s perceptions of others are formed by his or her own cultural conditioning education, and personal experiences.

　　(2) Sometimes perceptions differ because of what we choose to observe and how we deal with what we’ve observed. It is not necessarily true that person perception is based on observations of a particular person. Your observations may be totally controlled by what others have told you about this person; or you may focus (聚焦) primarily on the situation or role relationship. Most people do not use the same yardstick (标准) to measure their parents, their friends, and strangers.

　　(3) Sometimes we see only what we want to see or don’t see what may be obvious to others because of out own needs, desires, or temporary emotional states. This is a process known as selective perception. Selective perception is obviously more difficult when contradictory (矛盾的) information is particularly obvious, but it can be done. We can ignore (忽视) the stimulus- “He’s basically a good boy so what I saw was not shoplifting. ”

　　We can reduce the importance of the contradictory information- “All kids (孩子) get into mischief (顽皮) . Taking a book from the bookstore isn’t such a big deal. ” We can change the meaning of the contradictory information-”It wasn’t shoplifting because he was going to pay for it later.”…

1.The first factor given by the author that affects our perception is _____.

A．the abilities of one’s auditory (听) and visual (视) sensors

B．cultural background and personal experiences

C．experiences one learns from others

D．critical measures taken by other people

2.While observing a particular person, ______.

A．one is likely to take all aspects (方面) into consideration

B．one pays more attention to his/her advantages

C．children often differ from grown-ups in perception

D．one tends to choose certain cues (提示) to look for

3.Observation of the same person by two people at the same time may differ because ______.

A．their measuring yardsticks are not the same

B．either of them may be slow to catch information

C．the time for observation is not long enough

D．each of them uses different language to express his/her impressions

4.The word “stimulus ” in paragraph 4 refers to ______.

A．something attractive	B．selective perception
C．contradictory information	D．shoplifting

Learning experiences happen to us throughout our lives. Not long ago, I had one that I would like to __16__.

I was going to Marblehead with my sailboat team. The team was racing down the highway at 85 mph __17_ we realized we were __18_. Luckily, we saw a rest area ahead. I had a brand-new $20 bill. I was so __19_ because I had never had that kind of cash before. But spending it on __20__ seemed like throwing it away. We all rushed into the pizza line. __21__ I got a pizza and a drink, and walked to my table. About halfway through the meal, I __22_ I had not actually handed any money to the cashier. I had just __23__ out, and nobody had noticed. I felt terrible.

My conscience (良心) opened its mouth and swallowed me in one big bite. I couldn’t __24__ over it. I just couldn’t go back to the cashier and __25__ for my stolen pizza. I was so upset that I __26__ to give myself the pleasure of an ice cream for __27__ that someone would say, “Hey, Jeff, why not you use the change __28__ the pizza instead of that nice, new $20 bill?” I was not so __29__ of my cash now. For the next two years, whenever I was __30__ of the “pizza incident”, I would say to myself, “Don’t think about it…”

I have learned two things from this __31__. Maybe I was a fool for __32__ in to my conscience, and being too stupid to appreciate a __33__ pizza. But the real lesson is that even if you get away with what you have done, your conscience will __34__ up with you.

This reflects the saying, “Coward (懦夫) dies a thousand deaths, a hero dies one.” I was a coward and have felt terrible about that incident at least a thousand times. If I had been a “__35__” and gone back to pay for the pizza, I would have felt a little uncomfortable about it only one, or maybe twice.

1.

A．say

B．talk

C．share

D．explain

2.

A．as

B．while

C．then

D．when

3.

A．lost

B．tired

C．hungry

D．angry

4.

A．excited

B．eager

C．glad

D．anxious

5.

A．rest

B．food

C．travel

D．drink

6.

A．Luckily

B．Finally

C．Immediately

D．Actually

7.

A．thought

B．recognized

C．noticed

D．realized

8.

A．walked

B．left

C．worked

D．found

9.

A．look

B．get

C．turn

D．think

10.

A．ask

B．pay

C．apologize

D．send

11.

A．refused

B．wanted

C．hoped

D．meant

12.

A．hope

B．surprise

C．anger

D．fear

13.

A．into

B．with

C．for

D．from

14.

A．sure

B．upset

C．proud

D．pleased

15.

A．warned

B．reminded

C．thought

D．told

16.

A．experience

B．experiment

C．story

D．talking

17.

A．turning

B．talking

C．handing

D．giving

18.

A．free

B．cheap

C．plain

D．delicious

19.

A．make

B．wake

C．catch

D．put

20.

A．coward

B．fool

C．loser

D．hero

No one is glad to hear that his body has to be cut open by a surgeon（外科医生） and part of it taken out． Today， however， we needn't worry about feeling pain during the operation． The sick person falls into a kind of sleep，and when he awakes，the operation is finished. But these happy conditions are fairly new．It is not many years since a man who had to have operation felt all its pain．

Long ago， operation had usually to be done while the sick man could feel everything． The sick man had to be held down(压制，控制) on a table by force while the doctors did their best for him． He could feel all the pain if his leg or arm was being cut off， and his fearful cries filled the room and the hearts of those who watched．

Soon after 1770, Josept Priestley discovered a gas which is now called “laughing gas”．Laughing gas became known in America．Young men and women went to parties to try it．Most of them spent their time laughing，but one man at a party，Horace Wells，noticed that people didn't seem to feel pain when they were using this gas．He decided to make an experiment on himself．He asked a friend to help him．

Wells took some of the gas，and his friend pulled out one of Well’s teeth．Wells felt no pain at all．

As he didn't know enough about laughing gas，he gave a man less gas than he should have. The man cried out with pain when his tooth was being pulled out．

Wells tried again，but this time he gave too much of the gas，and the man died．Wells never forgot this terrible event．

1.It is ＿＿＿＿ since a man being operated felt all the pain．

A. a few more years B. not long C. few years D. two thousand years

2.Long ago，when the sick man was operated on, he ＿＿＿＿．

A. could feel nothing B. could not want anything

C. could feel all the pain D. could do anything

3.Using the laughing gas，the people did not seem to ＿＿＿＿．

A. be afraid of anything B. feel pain C. want to go to the parties D. be ill

4.If a man took less laughing gas than he should have when an operation went on，he ＿．

A．felt nothing B. felt very comfortable C．still felt pain D．would die

5. One who took too much of the laughing gas ＿＿＿．

A.would laugh all the time B.would die

C.would never feel pain D.would be very calm

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