It is pretty well understood____  controls the flow of carbon dioxide in and out the atmosphere today .

试卷相关题目

• 1Generally speaking ,____ according to the directions , the drug has no side effect .

  A.when taking

  B.when taken

  C.when to take

  D.when to be taken

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• 2Only when your identity has been checked ,____ .

  A.you are allowed in

  B.you will be allowed in

  C.will you allow in

  D.will you be allowed in

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• 3The discovery of new evidence led to____  .

  A.the thief having caught

  B.catch the thief

  C.the thief being caught

  D.the thief to be caught

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• 4It is these poisonous products____  can cause the symptoms of the flu , such as headache and aching muscles .

  A.who

  B.that

  C.how

  D.what

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• 5A good storyteller must be able to hold his listeners’ curiosity____  he reaches the end of the story .

  A.when

  B.unless

  C.after

  D.until

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• 6I can think of many cases____  students obviously knew a lot of English words and expressions but couldn’t write a good essay .

  A.why

  B.which

  C.as

  D.where

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• 7-Dad , I’ve finished my assignment .-Good , and____  you play or watch TV, you mustn’t disturb me .

  A.whenever

  B.whether

  C.whatever

  D.no matter

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• 8An army spokesman stressed that all the soldiers had been ordered____  clear warnings before firing any shots .

  A.to issue

  B.being issued

  C.to have issued

  D.to be issued

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• 9There is a new problem involved in the popularity of private cars____  road conditions need____  .

  A.that …to be improved

  B.which …to be improved

  C.where…improving

  D.when…improving

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• 10Some passengers complain that it usually____  so long to fill in travel insurance documents .

  A.costs

  B.takes

  C.spends

  D.spares

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