问题
单项选择题
The main types of social networking services are 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（）
A.net
B.interests
C.others
D.trust
答案
参考答案：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。