单项选择题

Every chemical change either results from energy being used to produce the change, or causes energy to be ______ in some form.

A．given off
B．put out
C．set off
D．used up
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单项选择题
In this factory the machines are not regulated ______ but are jointly controlled by a central computer system.
A．independently
B．individually
C．irrespectively
D．irregularly
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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