单项选择题

A pause can make all the ______ in the world between an effective speech and an ineffective one in the hands of a master.

A. difference
B. effect
C. impression
D. contribution

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Mark woke up one morning to find both water and electricity ______because he had not been able to pay the bills.
A. cut out
B. cut down
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单项选择题
______ automobile pollution, the air quality in most major cities has been lowered.
A. As a result of
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C. But for
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