题目内容

The CAN-SPAM Act has proven to be more effective than spam blockers at preventing unwanted e-mail.

A. 对
B. 错

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Instant messaging allows text only.

A. 对
B. 错

Cloud computing is an example of a social networking site.

A. 对
B. 错

LinkedIn is a social networking site that you should visit if you are looking for professional employment.

A. 对
B. 错

After a webcast is completed there are no files left on your computer.

A. 对
B. 错