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單項選擇題

As there was a power failure in the hospital, the doctor had to （）operation.

A.call for
B.call off
C.call on
D.cal lout

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單項選擇題

Television keeps us informed about （）events and the latest developments in politics and science.

A.current
B.past
C.favorable
D.new

單項選擇題

Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.

A.like
B.as
C.of
D.about