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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单项选择题
Which of the following is NOT true
A．Many countries are making rules to fight pollution.
B．The pollution of the earth grows as fast as the world's population does.
C．If people could go to work by bus or bike instead of car or motorbike it would be helpful in fighting against the problem of SO2.
D．The problem of pollution is not so serious because there are not so many people living on the earth.
单项选择题
The writer of the article has a ______ attitude towards dangerous sports.
A．positive
B．negative
C．neutral
D．nervous
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