题目内容

指纹识别技术，根据扫描方式的不同，分为三大类：、、。

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为了防止指纹膜等安全隐患，可以采用技术。

Sometimes what appear to be problems (is, are) easily solved.

A. is
B. are

Joan is one of those people who (go, goes) out of their way tobe helpful.

A. go
B. goes

He is the only one of those boys who (is, are) willing to help others.

A. are
B. is