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
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单项选择题
Which of the following statements best expresses the main idea of the passage
A．World leaders must give high-level attention to global environmental problem.
B．The future of the planet is dependent on international economic cooperation.
C．Preceding generations were overly concerned with economic problems.
D．Existing political and social institutions can solve current environmental concerns.
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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