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
Some criminals were printing ________ dollar bills until they were arrested.
A．decent
B．fake
C．patent
D．suspicious
单项选择题
To prevent flooding in winter the water flowing from the dam is constantly ________ by a com- puter.
A．graded
B．managed
C．conducted
D．monitored
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