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
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单项选择题
When workers are organized in trade unions, employers find it hard to lay them ______.
A．off
B．aside
C．out
D．down
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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