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阅读表达（共5小题；每小题3分，满分15分） 阅读下面的短文，并根据短文后的要求答题。（请注意问题后的词数要求）        〔1〕Too much TV-watching can harm children’s ability to learn and even reduce their chances of getting a college degree, new studies suggest in the latest effort to examine the effects of television on children．        〔2〕One of the studies looked at nearly 400 northern California third-graders．Those with TVs in their bedrooms scored about eight points lower on math and language arts tests than children wi已知等差数列{an}的公差d≠0,且a1,a3,a9成等比数列,则=(　　)A．B．C．D．