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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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
It seems that now a country's economy depends much on ______.
A．how well-developed it is electronically
B．whether it is prejudiced against immigrants
C．whether it adopts America's industrial pattern
D．how much control it has over foreign corporations
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