单项选择题

The North American desert, a vast belt of inhospitable terrain, stretches erratically down the western side of the continent.

A．endlessly
B．irregularly
C．ominously
D．longitudinally
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单项选择题
Today in the United States, adult education facilities face rising demand created by expanding leisure time.
A．relaxing
B．structured
C．increasing
D．unused
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