You have failed toew tests. You’d better start working harder, ____you won’t pass the course。

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• 1 Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in

  A.、Cell phone use is dangerous。

  B、Cell phone use causes cancer。

  C、The human brain is an electromagnetic field。

  D、There are about 5 billion cell phone users in the world right now。

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• 2 _____ ten minutes earlier, you wouldn't have missed the train，but you were late。

  A. Had you come B. Did you come 　C. Have you come D. Should you come

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• 3 —How are their talks going on? Have they reached any agreement? —They only seemed to have agreed

   

  A. deeper B. slower C. further D. higher

  
  

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• 4 I can ____you that the animals are well cared for in our zoo, so you needn't worry about them.

  A. suppose B. assume C. assure D. grant

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• 5 I'm very grateful for your help and hope to do something for you_____in the future.

  A. in exchange B. instead C. in return D. in particular

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• 6 _____by a large audience, he felt very nervous and didn't know what to say.
   

  A. Watching B. Watch C. Watched D. Having watched

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• 7 All the kids are crying now. What_____makes them so unhappy?
   

  A. it is B. is it C. it is that D. is it that

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• 8 According to Schwarz's findings, who are more likely to get diabetes later in life?

  A. Those mothers who had never breastfed. 　B. Those mothers who never gave birth.

  C. Those mothers who breastfed for a month. D. Those mothers who breastfed for six months.

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• 9 Breastfeeding (母乳喂养) for a month or longer appears to reduce a woman's risk of getting diabete
   

  A. About two thousand and two hundred old women took part in the study.

  B. Eleanor Schwarz's research program was about men and women who suffered from diabetes.

  C. Over one fifths of the women never got married.

  D. Eleanor Schwarz's results seem more reliable.

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• 10 People have just come to realize that_______.

   

  A. human attention is a scarce resource 　B. city life can make people very tired

  C. the city is an engine of intellectual life D. an urban environment is damaging to the brain

  
  

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