【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(dān)憂的；C. countless無數(shù)的；D. steady穩(wěn)定的。句意：飛機(jī)失事的頻率基本上是隨機(jī)的，但有時確實(shí)是成群結(jié)隊(duì)的。結(jié)合句意可知答案為A。

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