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【题目】The frequency of airline crashes is basically ______, but they do sometimes come in bunches.

A. random B. alarming C. countless D. steady

【答案】A

【解析】

考查形容词。A. random任意的;B. alarming令人担忧的;C. countless无数的;D. steady稳定的。句意:飞机失事的频率基本上是随机的,但有时确实是成群结队的。结合句意可知答案为A。

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