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

One of the reasons why the long-term trend of prices has been downwards is that ______.

A．technological innovation can promote social stability
B．political instability will cause consumption to drop
C．new farming and crop technology can lead to overproduction
D．new sources are always becoming available

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