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 main cause of pollution is ______.
A．the release of artificial or natural substances into the environment
B．the production of new industrial goods
C．increased amounts of a natural substance
D．our ever-increasing population
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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