单项选择题
Man may destroy the balance of nature, but from time to time, nature takes a terrible______.
A．attack
B．threat
C．lesson
D．revenge
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单项选择题
Before the First World War, female secretaries were rare because they ______.
A．wore stockings
B．were not as serious as men
C．were less efficient than men
D．would have disturbed the other office workers
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单项选择题
Which of the following would be the best title for the passage
A．Monopolies
B．The Commodity Market
C．The Competition Continuum
D．The Best Type of Competition
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