单项选择题

The award-winning beach house is quite strong because ______.

A．it is strengthened by steel rods
B．it is made of redwood
C．it is in the shape of a shell
D．it is built with timber and concrete

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单项选择题

A．In San Francisco.B．In Washington.C．In Chicago.D．In New York.

A．In San Francisco.
B．In Washington.
C．In Chicago.
D．In New York.

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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