单项选择题

The environmental balance will be upset by ______.

A．waste products
B．the whole industrial process
C．many of the goods
D．some machines we need and use in our daily life
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单项选择题
The release of oil from oil tankers into the sea is ______.
A．the only source of pollution
B．a kind of pollution caused by the release of natural substances
C．of worldwide consequence
D．most harmful to mankind
单项选择题
Governments attach importance to the Internet because it ______.
A．offers economic potentials
B．can bring foreign funds
C．can soon wipe out world poverty
D．connects people all over the world
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