单项选择题

It is conventionally thought that ______.

A．only rich countries can afford to care about environmental problems
B．developing countries should also be thinking about the environment
C．environmental problems exist only in the rich world
D．rich countries have not paid enough attention to the health of the planet
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单项选择题
The passage is written for the purpose of ______.
A．analyzing the difference between the environmental problems in rich and poor countries
B．arguing why developing countries should take immediate action to deal with their environmental problems
C．demonstrating how serious damage pollution can cause to a country's economic development
D．explaining why the developed world's environmental concerns have little to do with immediate threats
单项选择题
It can be inferred from the passage that ______.
A．developing countries should worry about the harm caused by polluted water and air
B．the developing countries' economy will develop more rapidly if they deal with environmental problems right now
C．the conventional wisdom has it that solving environmental problems may hurt economic growth
D．the conventional wisdom holds that dealing with environmental problems now will generally cost less
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