单项选择题

It is implied in the second paragraph that _________.

A．clear air is necessary for people's health
B．we don't have to worry about future developments
C．we should control overexploitation of the nature
D．people can produce more energy to meet industrial demands
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单项选择题
In the second paragraph, the author uses the word self-sufficiency to mean that _________.
A．economic development damages our future
B．we should return to the productive mode in the past decades
C．people uses their own things rather than borrowing from others
D．we must reduce the environmental cost of economic development
单项选择题
Which of the following might be the best title for the passage
A．Self-efficiency
B．The Importance of Environment Protection
C．Environment Protection and Economic Development
D．Industrialized Countries Should Help Developing Countries Protect Environment
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