Once ________, nothing can be feared.


  1. A.
    understand
  2. B.
    understood
  3. C.
    to understand
  4. D.
    to be understood
B
解析：此句意思是“一且懂得了，什么事情都個可怕”。once understood是once it is understood的省略，用過去分詞understood表示被動。
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36.

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D. unless

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 A. She was not familiar with the road.           

 B. It was dark and raining heavily then.   

C. The railway works failed to give the signal.

D. Her GPS device didn’t tell her about the crossing

2.

The phrase”near miss” (paragraph 2 ) can best be replaced by _______.    

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3.

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4.

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5.

What is the real concern of the writer of this article?

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