【題目】—It is reported that only 40% of teenagers in China sleep for more than eight hours a day.

—Too terrible. It means about ______ of teenagers do not get enough sleep.

A.three fifthB.three fifthsC.five thirdsD.two fifths

【答案】B

【解析】

句意：——據(jù)報(bào)道，中國(guó)只有40%的青少年每天睡眠時(shí)間超過(guò)8小時(shí)。——太可怕了。這意味著大約五分之三青少年睡眠不足。

考查分?jǐn)?shù)表達(dá)。分?jǐn)?shù)的表達(dá)為分子為基數(shù)詞，分母為序數(shù)詞；當(dāng)分子大于1時(shí)，分母加s；排除AC。由“40%超過(guò)8小時(shí)睡眠”可知，60%睡眠不足，即五分之三睡眠不足。故選B。

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