【題目】Many teenagers are fond of extreme sports such as climbing and parkour (跑酷). Before trying such sports, they ______ learn safety rules first.

A.shouldB.mayC.couldD.might

【答案】A

【解析】

句意：許多青少年喜歡極限運動，例如攀巖和跑酷。在嘗試這些運動之前，他們應當首先學習安全規(guī)則。

考查情態(tài)動詞。A. should應當、應該；B. may可能、也許；C. could can的過去式，能、會；D. might may的過去式，可能、也許。根據(jù)句意可知，故選A。

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