单项选择题

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

A．put
B．settle
C．drag
D．knock
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单项选择题
Professor Taylor's talk has indicated that science has a very strong______on the everyday life of non-scientists as well as scientists.
A．motivation
B．perspective
C．impression
D．impact
单项选择题
In 1914, an apparently insignificant event in a remote part of Eastern Europe ______Europe into a great war.
A．inserted
B．imposed
C．pitched
D．plunged
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