单项选择题

Which of the following could serve as the best title for the passage

A．Pollution -- the Necessary Evil
B．The Causes of Pollution
C．Pollution and Agriculture
D．Anti-pollution Needs Your Efforts
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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
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
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