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    【题目】—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：——据报道，中国只有40%的青少年每天睡眠时间超过8小时。——太可怕了。这意味着大约五分之三青少年睡眠不足。

    考查分数表达。分数的表达为分子为基数词，分母为序数词；当分子大于1时，分母加s；排除AC。由“40%超过8小时睡眠”可知，60%睡眠不足，即五分之三睡眠不足。故选B。

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