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_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.


  1. A.
    As
  2. B.
    While
  3. C.
    Because
  4. D.
    If
B
解析:
考查连词特殊用法。While然而;结合句意可知B正确。句意:尽管地震科学家理解地震是如何为什么发生,但是预测通常是不准确的。
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