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
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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
单项选择题
To an especially sensitive child, a simple scolding can be a ______ experience.
A. hysterical
B. grievous
C. gracious
D. sensible
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