Some scientists think there are _______ 2，000 million flashes of lightning per year.
A．in shortB．on averageC．a(chǎn)s usualD．in total
B

試題分析：短語辨析。A簡而言之；B平均；C和平時一樣；D總共；句意:一些科學(xué)家認(rèn)為每年平均有2千多閃電。故B正確。
點評：不同的短語要放在上下文中進行辨析。本題要特別注意AD項，是經(jīng)�？疾榈亩陶Z。
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