单项选择题

All ______ is peace and progress.

A. what is needed
B. for our needs
C. the thing needed
D. that is needed
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单项选择题
As there was a power cut in the hospital, the surgeon had to ______ the operation.
A. call for
B. call off
C. call on
D. call out
单项选择题
From ancient times, the valley of the Nile has been made ______ by the river floods.
A. famous
B. deserted
C. attractive
D. fertile
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