单选题：What’s the main idea of this passage?

题目分类：英语四级
题目类型：单选题
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题目内容：

What’s the main idea of this passage? A．Google aims to replace passwords with physical tokens．
B．The problems of passwords are drawing more attention．
C．Passwords are predicted to disappear．
D．Finding alternatives of passwords remains a tall order．

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答案解析：

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