【題目】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】

考查形容詞。A. random任意的；B. alarming令人擔憂的；C. countless無數(shù)的；D. steady穩(wěn)定的。句意：飛機失事的頻率基本上是隨機的，但有時確實是成群結隊的。結合句意可知答案為A。

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