兰州大学《大学英语（3）》平时作业2

奥鹏兰州大学平时在线作业

《大学英语（3）》21春平时作业2

If I had hurried, I __________ the train.
A:wouldcatch
B:wouldhavecaught
C:couldcatch
D:hadcaught
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After ten years,all those youngsters became___
A:growns-up
B:growns-up
C:grown-up
D:grown-ups
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___________, a mechanic and farmer, Edward received an interest in practical science that stayed with him throughout his life.
A:His father
B:From his father
C:It was his father
D:His father was
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_______ new bridge has been built over_____ Huangpu River．
A:The a
B:A ／
C:A the
D:An the
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At that time Tom was _______ one-year-old baby．
A:a
B:an
C:the
D:／
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The survival ________ of some wild animals is not very high as they are ruthlessly hunted for their skins.
A:degree
B:rate
C:ration
D:scale
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No one imagined that the apparently ____________ businessman was really a criminal.
A:respectful
B:respectable
C:respective
D:respected
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. Great as Newton was , many of his ideas ______ today and are being modified by thework of scientists of our time.
A:are to challenge
B:may be challenged
C:have been challenged
D:are challenging
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He has__ books in his study.
A:severalthousands
B:somethousandsof
C:somethousands
D:somethousandof
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We must leave the party at exactly 9:00 _____________ we will be late for work.
A:for else
B:other
C:else
D:otherwise
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The conference ________ a full week by the time it ends.
A:must have lasted
B:will have lasted
C:would last
D:has lasted
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He used to be _______ teacher but later he turned _______ 奥鹏兰州大学平时在线作业writer．
A:a a
B:a the
C:／ a
D:a ／
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For a long time they walked without saying ___word .Jim was the first t break _____silence.
A:the,a
B:a,the
C:a,/
D:the,/
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The cakes are delicious . He’d like have ______third one because _____second one is rather too small.
A:a,a
B:the.the
C:a,the
D:the,a
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．How many books do you have？ I have _______ book．That's _______ English book
A:a an
B:a one
C:one an
D:one one
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Passage 2 Sam and Joe were astronauts. There was once a very dangerous trip and the more experienced astronauts knew there was only a small chance of coming back alive (活着). Sam and Joe, however, thought it would be exciting though a little dangerous. were the best men for the job, they said to the boss. There may be problems, but we can find the answers. Theyre the last people Id trust, thought the boss. But all the other astronauts have refused to go. Once they were in space, Joe had to go outside to make some repairs. When the repairs were done, he tried to get back inside the spaceship. But the door was locked. He knocked but there was no answer. He knocked again, louder this time, and again no answer came. Then he hit the door as hard as he could and finally a voice said, Whos there? Its me! Who else could it be? shouted Joe. Sam let him in all right but you can imagine that Joe never asked to go on a trip with Sam again!
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Passage 1 Can trees talk? Yes, but not in words. Scientists have reason to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First a willow tree attacked in the woods by caterpillars (毛虫) changed the chemistry of its leaves and made them taste so terrible that they got tired of the leaves and stopped eating them. Then even more astonishing, the tree sent out a special smell—a signal causing its neighbors to change the chemistry of their own leaves and make them less tasty. Communication, of course, doesnt need to be in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar (花蜜) for honey. So why shouldnt trees have ways of sending message?
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Do you find getting up in the morning so difficult that its painful? This ## called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy ## .　　During the hours when you ## your work you may say that youre hot. Thats true. The time of day when you feel most ## is when your cycle of body temperature is ## its peak. For some people the peak comes during the forenoon. For ## it comes in the afternoon or evening. No one has discovered why this is so, but it ## such familiar monologues (自言自语) as: Get up John! Youll be late for work again! The possible explanation to the trouble is that John is at his ## and energy peak in the evening, ## family quarrelling ends when husbands and wives realize ## these energy cycles mean, and which cycle each member of the ## has.　　You cant change your energy cycle, but you can learn to make your life ## it better. ## can help, Dr. Kieitman believes. Maybe youre sleepy in the evening but feel you must ## late anyway. Counteract (对换) your cycle ## by habitually staying up late than you want to.
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（根据阅读理解Passage1回答问题）How do birds communicate with each other?
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（汉译英）年复一年，女人在女儿、妻子、母亲中熬白了头发，可是回首往事时，依然是那句朴素的我愿意。
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Instructions: Mobile phones and the Internet play an important part in the way in which people relate to one another socially. Is this a positive or negative development? You should write at least 150 words . 手机和互联网在人们的社会关系里扮演着重要的角色。这种发展是积极的还是消极的？用英语写出一篇不少于150字的短文。题目自拟。
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（根据阅读理解Passage2回答问题）What do you think is the life of astronauts like?
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（英译汉）Although no longer slaves after the Civil War, American blacks took no significant part in the life of white America except as servants and labours.
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