单项选择题

A．Information superhighway.
B．Junk mails.
C．E-commerce.
D．How to send e-mails.
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单项选择题
A．He is a stranger to the stock.B．He is confident of his investment.C．He likes the stock very much.D．He is the student of the woman.
A．He is a stranger to the stock.
B．He is confident of his investment.
C．He likes the stock very much.
D．He is the student of the woman.
填空题
The two pollutants that cause acid deposition are______and nitrogen oxides (NOx).
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