初中英语阅读理解的一道题..
通过此句：Internet has because so popular that 90 percent of 12-to-17-year-olds in the United States use the Internet,and about half of these kids use it every day.
问:What persentage of American 12-to-17-year-olds use the Internet every day?
A.about 45% B.about 50% C.about 80% D.about 90%
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half of these kids use it every day.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- -