答案　C

　　Ⅲ.根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　Safe Social Networking Tips for Teenagers

　　More than 60 percent of American teenagers have at least one profile① on a social networking site.Many of them spend more than two hours a day on social networking sites，according to the American Academy of Child and Adolescent Psychiatry (美国儿童和青少年精神病学研究院)．

　　Like many activities，social networking sites have two sides to them.__1__Parents need to help their children to use these social networking sites wisely，the academy advises.

　　Potential benefits include：__2__；developing new social contacts with peers② who have similar interests；sharing ways of self­expression，such as music，artwork and political views；and development and expression of individual identity.

　　__3__：cyber­bullying③；sharing too much personal information；regrets about sharing certain photos or videos；large amounts of marketing that may not be age­appropriate.

　　Parents can help children to use social networking sites safely and appropriately.They should have an open discussion with their children about the topic，according to the advice of the academy in a news release.Parents should give their children some helpful suggestions：

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