The main types of social networking services ar e those that contain category places(such as former school year or classmates)，w

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问题 The main types of social networking services ar e those that contain category places(such as former school year or classmates)，which means to connect with friends (usually with self-description pages)，and a recommendation system linked to ( ) ．

选项 A、net
B、interests
C、others
D、trust

答案D

解析该题考查的是沟通。
题目翻译：现在主要类型的社会网络服务是那些含有场所(如同年级学友或同学)，意味着与朋友(通常与自我介绍网页)互动联络，以及推荐系统与信任。

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