This passage is mainly talking about______.A．the fast expanding of social networking sites
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This passage is mainly talking about______.
A．the fast expanding of social networking sites
B．the popularity of smartphones and social networks
C．the development and advantages of tablet computers
D．the fierce competition in the operating system industry
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
主旨题。本题考查对文章的整体理解。通读全文可知，本文主要论述了智能手机和社交网络的兴起与发展，并具体介绍了各个领域一些代表性产品或企业的现状，[B]与之相符，故为答案。[A]和[C]含义片面化，未涉及智能手机这个话题，故排除；[D]提及的操作系统行业竞争为文章细节，属于以偏概全，故排除。