单项选择题

The word "they" (sentence 4, para. 1) refers to ______.

A．economists
B．chemists
C．world leaders
D．environmentalists
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单项选择题
The passage tells us that the future of the planet is dependent on all of the following EXCEPT
A．arresting the carbon dioxide buildup
B．protecting the ozone layer
C．restoring forests
D．conserving water
单项选择题
According to the passage, how does the present generation differ from preceding generation
A．It is more concerned with past events.
B．It is faced with major decisions about the Earth's future.
C．It is not aware of the problems it faces.
D．It has problems that do not require immediate attention.
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