Air pollution is ________ by waste gases of cars.


  1. A.
    main cause
  2. B.
    mainly causing
  3. C.
    main caused
  4. D.
    mainly caused
D
解析：be caused by意為“被引起”。mainly是副詞，修飾動(dòng)詞caused。
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  1. 1.

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    1. A.
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    4. D.
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  2. 2.

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    1. A.
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    3. C.
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    4. D.
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  3. 3.

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    1. A.
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    3. C.
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    4. D.
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  4. 4.

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    1. A.
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    2. B.
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    3. C.
      it has made our rivers and lakes dirty
    4. D.
      it makes us become angry more easily
  5. 5.

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    1. A.
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    2. B.
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