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
Frequently single-parent children______some of the functions that the absent adult in the house would have served.
A．take off
B．take after
C．take in
D．take on
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
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