专四

单选题As to the time youngsters spend on electronic devices, they spend __________ hours a day altogether.

A． 6.5
B． 7.5
C． 9.5
D． 11

参考答案：C进入在线模考
细节题。由选项中的内容定位至第二段。首句和第二句说明学生花在使用电子设备上的总的时间是7．5+1．5+0．5=9．5小时，故[C]为答案。“compared with less than six and a half hours five years ago”表明6．5小时是5年前的数字，排除[A]；而7．5小时是第二段首句提到的时间，但是没有包括发送短信以及通电话的时间，题于中的altogether表明这是总时间，排除[B]；末句表明是11个小时的内容，但实际未花11个小时，排除[D]。

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