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
When a number of people ____________ together in a conversational knot, each individual expresses his position in the group by where he stands.
A．pad
B．pack
C．squeeze
D．cluster
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