27. People have become aware ______the fact that carbon dioxide, poison to the e

27. People have become aware ______the fact that carbon dioxide, poison to the e

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27. People have become aware ______the fact that carbon dioxide, poison to the environment, contributes_____ air pollution.
A.of, toB./, toC.of, ofD.of, for

答案
A
解析

举一反三

29. The key ____ English well is to read more when ____.
A.to learn, possibleB.of learning, possibly
C.of learning, was possibleD.to learning, possible

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30. People ran out __________ as fire tore through the building.
A.with vainB.in ragsC.with one voiceD.with fear

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28  He spoke very slowly, but he still didn’t get his meaning _______.
A  across       B  cross          C  through        D  though
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Why not describe what you saw that day___? It will surely help the police to find out who were to blame for the terrible accident.
A.in orderB.in returnC.in detailD.in charge

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Welcome to the World Expo, which will take place in Shanghai        May 1       
October 31.
A.during; onB.from; toC.between; ofD.on; till

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