单项选择题

The primary solution to environmental problems is______.

A．to allow market forces to operate properly
B．to curb 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

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

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
C．improper methods of fishing have mined the fishing grounds
D．water pollution is extremely serious