单项选择题

The huge increase in world production and population ______.

A．has made the world a worse place to live in
B．has had a positive influence on the environment
C．has not significantly affected the environment
D．has made the world a dangerous place to live in
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单项选择题
The primary solution to environmental problems is ______.
A．to allow market forces to operate properly
B．to control consumption of natural resources
C．to limit the growth of the world population
D．to avoid fluctuations in prices
单项选择题
According to the author, most students ______.
A．believe the world's environment is in an undesirable condition
B．agree that the environment of the world is not as bad ms it is thought to be
C．get high marks for their good knowledge of the world's environment
D．appear somewhat unconcerned about the state of the world's environment
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