单项选择题

Many people think of deserts as （）regions, but numerous species of plants and animals have adapted to life there.

A．virgin
B．barren
C．void
D．wretched

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单项选择题
To prevent flooding in winter the water flowing from the dam is constantly （）by a computer.

A．graded
B．managed
C．conducted
D．monitored
单项选择题
By signing the lease we made a（）to pay a rent of $ 150 a week.

A．conception
B．commission
C．commitment
D．confinement
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