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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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
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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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