2. 外语
  3. The data showed that there are up to 20 times more lightning flashes within clouds______by the ground-based network.

The data showed that there are up to 20 times more lightning flashes within clouds______by the ground-based network.

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问题 The data showed that there are up to 20 times more lightning flashes within clouds______by the ground-based network.
选项 A、than they observe
B、than what have been observed
C、as what is observed
D、than are observed
答案D
解析 比较级题。根据选项和题干中的more可确定本题考查than的用法。本题可把than看作关系代词，充当句子主语。例如句子“I spent more money than was intended to be spent．”也有解释为than从句省略主语。注意than连接从句时具有省略性、倒装性和对称性特点。本题空格后为by，同时根据含义，具有被动含义，且从句表示的是现存的事实，故D为本题答案。
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