单项选择题

A．Information superhighway.
B．E-commerce.
C．Junk mails.
D．How to send e-mails.
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单项选择题
A．$2.5.B．$5.C．$7.5.D．$10.
A．$2.5.
B．$5.
C．$7.5.
D．$10.
填空题
Individuals can contribute directly to solving the problem of acid deposition by______.
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