单项选择题

Thousands of years ago, life was （） it is today.

A．much easier than
B．as easy as
C．as hard as
D．much harder than

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单项选择题
Air pollution is the most serious kind of pollution because （）

A．it's bad for all living things in the world
B．it makes much noise
C．it makes our rivers and lakes dirty
D．it makes us angry more easily
单项选择题
Pollution comes in many ways. We can even hear it. Here it means （） .

A．water pollution
B．air pollution
C．noise pollution
D．rubbish
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