(单选题)

What does the author say about social network?

A.They have effects similar to those of a marriage.

B.They help develop people’s community spirit.

C.They provide timely support for those in need.

D.They help relieve people of their life’s burden.

参考答案：A

参考解析：

推理判断题。根据文章首段第三句the biggest longevity (长寿) boost seems to come from marriage or an equal relationship.与最后一段首句A life partner, children and good friends are all recommended if you aim to live to 100.可知social network与marriage的作用类似，故选A。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语

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