第15题: [单项选择]According to the writer, insurance is ______. A. useful but too risky B. useful and necessary C. costly but worth buying D. cheap but not necessary 参考答案:C 答案解析:[精解] 题干意为“根据文章,保险是…”。该题为主旨题。文章先说明保险的可行性,又说明保险费不是很高,投保的人还会受益,可以看出保险虽然很费钱,但是还是值得买的。