单项选择题

Wolves were ______ mournfully in the nearby forest at night.

A．groaning
B．howling
C．barking
D．roaring
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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
Which of the following could serve as the best title for the passage
A．Pollution -- the Necessary Evil
B．The Causes of Pollution
C．Pollution and Agriculture
D．Anti-pollution Needs Your Efforts
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