【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(yùn)動(dòng)，例如攀巖和跑酷。在嘗試這些運(yùn)動(dòng)之前，他們應(yīng)當(dāng)首先學(xué)習(xí)安全規(guī)則。

考查情態(tài)動(dòng)詞。A. should應(yīng)當(dāng)、應(yīng)該；B. may可能、也許；C. could can的過(guò)去式，能、會(huì)；D. might may的過(guò)去式，可能、也許。根據(jù)句意可知，故選A。

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