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Some scientists think there are _______ ...

Some scientists think there are _______ 2,000 million flashes of lightning per year.

A.in short

B.on average

C.as usual

D.in total

 

B 【解析】 试题分析:短语辨析。A简而言之;B平均;C和平时一样;D总共;句意:一些科学家认为每年平均有2千多闪电。故B正确。 考点:考查定语辨析
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