单项选择题

Last Sunday she came to visit US out of the blue．The italicized phrase means ______．

A．unexpectedly
B．unhappily
C．untidily
D．unofficially
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单项选择题
The scientists have made an ______ study of the viruses that cause the disease.
A. exhausted
B. exhausting
C. exhaustive
D. exhaustion
单项选择题
The football match was ______ because of the heavy rain.
A. called over
B. called up
C. called out
D. called off
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