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

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热门试题

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

According to the passage, the more new goods, _____.

A．the less pollution we have
B．the harder pollution can be done away with
C．the more pollution there will be
D．the higher our living standard will be