选择题：According to the text, what is the major cause of the flooding spam?

题目内容：

According to the text, what is the major cause of the flooding spam?

A.Companies rely on e-mail for communications.

B.More people in the world communicate by e-mail.

C.Many computer viruses contain spam e-mail.

D.More advertisers begin to promote sales through spam.

参考答案：【答案仅供学习，请勿对照自行用药等】

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