If____________ , the polluted air can result in deadly diseases or even death.

试卷相关题目

• 1I want to know who________for the spoiled child.

  A.is to be blamed

  B.to blame

  C.should blame

  D.to be blamed

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• 2______ the call for help, the boys immediately rushed out to see what was going on.

  A.In order to hear

  B.Hearing

  C.Having heard

  D.They heard

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• 3It isn't cold enough for there _____ a frost tonight, so I can leave Lim's bike out safely.

  A.would be

  B.being

  C.was

  D.to be

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• 4--- She should not have done that sort of thing. ---Whatever she did was reasonable, _____ what you had done. Besides, it's none of your business.

  A.compared with

  B.comparing to

  C.compare to

  D.comparing with

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• 5_______ enough is quite necessary for your health, so you shouldn't stay up too late every day.

  A.Sleep

  B.Sleeping

  C.To sleep

  D.Having slept

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• 6She remained ______ for a while after the movie ended, which made others ______.

  A.sitting; puzzling

  B.sat; puzzled

  C.seated; puzzled

  D.seated; puzzling

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• 7Unless they are programmed by humans, computers are nothing more than big pieces of metal. But once _____ what to do, they show extraordinary power in carrying it out.

  A.taught

  B.teaches

  C.teaching

  D.to teach

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• 8At that time people would starve if food was difficult _______, especially during the cold winter months.

  A.finding

  B.to find

  C.found

  D.to be found

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• 9______more effectively with foreign firms, many Chinese firms have turned to new technology．

  A.Being competed

  B.To compete

  C.Competing

  D.Competed

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• 10In the busiest season the peasants were seen _________ their tractors _________from morning till night.

  A.have, work

  B.have, working

  C.to have, working

  D.to have, be worked

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