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
From the information given in the passage, the author's main concern is that _________.
A．the environment well-being and our health are related
B．the environment and the results of our exercising is relevant
C．the ever changing living standards demand more from the environment
D．the balance of environment and economic development is vital for the society
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