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
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
单项选择题
Digital divide is something ______.
A．getting worse because of the Internet
B．the rich countries are responsible for
C．the world must guard against
D．considered positive today
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