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
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
单项选择题
Governments attach importance to the Internet because it ______.
A．offers economic potentials
B．can bring foreign funds
C．can soon wipe out world poverty
D．connects people all over the world
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