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
单项选择题
Our world is becoming much smaller ______.
A．because the earth is being polluted day and night
B．thanks to science development
C．because of the rise in population
D．because the earth is blown away by the wind every years
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