单项选择题

They have built canals to irrigate the desert.

A．decorate
B．change
C．visit
D．water
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单项选择题
Stock market price tumbledafter rumor of a rise in interest rate.
A．regulated
B．increased
C．fell
D．maintained
单项选择题
The coastal area has very mildwinter, but the central plains remain extremely cold.
A．warm
B．severe
C．hard
D．dry
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