单项选择题

Alter the tragedy mused by Hurricane Hugo, new houses built along South Carolina's shore line are required ______.

A．to be easily reinforced
B．to look smarter in design
C．to meet stricter building standards
D．to be designed in the shape of cubes
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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
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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