初中英语阅读理解的一道题..
通过此句:Internethasbecausesopopularthat90percentof12-to-17-year-oldsintheUnitedStatesusetheInternet,andabouthalfofthesekidsuseiteveryday.
问:WhatpersentageofAmerican12-to-17-year-oldsusetheInterneteveryday?
A.about45%B.about50%C.about80%D.about90%
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halfofthesekidsuseiteveryday.可以知道啊,可是翻开练习册后面的答案,是A,怎么回事?是我错了还是它错了--