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. New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.

A. is used; not to pollute       B. has used; is not polluted

C. is being used; do not pollute     D. has been used; to pollute

C


解析:

本題主要考查動詞的時態及語態的應用。第 1 空強調目前所正在進行的一種行為。由于主語是動作的承受者,應該使用現在進行時的被動語態;第 2 空強調一般經常性的行為,應該用一般現在時。因此本題的正確答案選C。

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(1)

According to the passage all the following are right EXCEPT that ________.

[  ]

A.

The new technology would use electrodes to pick up code words that soldiers were thinking

B.

The improvement of synthetic telepathy is one of projects of the Defense Advanced Research Projects Agency

C.

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D.

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[  ]

A.

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B.

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[  ]

A.

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C.

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A.

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D.

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A.

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C.

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D.

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