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科目: 来源: 题型:单选题

Bicycles have been around in our life for more than hundreds of years, but no one knows who ________ the first bicycle.


  1. A.
    invented
  2. B.
    had invented
  3. C.
    has invented
  4. D.
    would invent

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科目: 来源: 题型:单选题

High-speed trains travel at 300 kilometers an hour,which is about      normal trains.


  1. A.
    four times the speed as
  2. B.
    the speed four times of
  3. C.
    four times as the speed of
  4. D.
    four times the speed of

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同步练习册答案
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