，故选A。
【点评】考查阅读理解。本文考查细节题和主旨题等常考题型，细节题要注意从文中抓住关
键词寻找答案；主旨题需要通读全文，了解大意之后找出主题句。
4阅读材料，然后从各题所给的四个选项中选出一个最佳答案。
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