单项选择题

Nobody yet knows how long and how seriously the shakiness in the financial system will the economy.

A．knock down
B．drag down
C．settle down
D．put down
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单项选择题
Their ______ -- that their project under way was something entirely new proved to be untrue.
A．repetition
B．assumption
C．impression
D．comparison
单项选择题
North American fur trade ______ in the early 1800' s mainly due to the diminishing number of fur-bearing animals.
A．ceased
B．staggered
C．waned
D．collapsed
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