单选题：What is this passage mainly about?

题目内容：
What is this passage mainly about? A．Disadvantage of face recognition technology.
B．Purposes of face recognition technology.
C．Controversial face recognition technology.
D．Effect of face recognition technology.
参考答案：
答案解析：

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分类：公共英语四级  题型：单选题
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According to this passage, a money market . A．provides convenient services to it

分类：公共英语四级  题型：单选题
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根据下面资料，回答题： In the 1960s the West Coast became an important

根据下面资料，回答题： In the 1960s the West Coast became an important center for rock mus

分类：公共英语四级  题型：单选题
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