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

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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

单项选择题

Fish resources are diminishing because ______.

A．no new substitutes can be found in large quantities
B．they are not owned by any particular entity(实体)
C．improper methods of fishing have ruined the fishing grounds
D．water pollution is extremely serious