单项选择题

According to the passage, acid rain is ______.

A．a source of pollution
B．an effect of industrialization
C．an advantage of industrial society
D．a deposition of fossil fuels
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单项选择题
Acid rain ______.
A．immediately kills trees and affects aquatic life in lakes and rivers
B．deposits various metals iron, mercury, aluminum into the soil
C．kills forests by weakening them and reduces fish populations
D．releases sulfur dioxide, nitrogen oxide and into the atmosphere
单项选择题
Which of the following is NOT available so far but yet to develop
A．Emerging standards.
B．Voice communication.
C．Video tele-conferencing.
D．High-speed ISDN and cable links.
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