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
He failed his exam ,and it ______ him right because he had not studied for the whole semester.
A．served
B．taught
C．gave
D．showed
单项选择题
Free medical treatment in this country covers sickness of mind as well as ______ sicknesses.
A．normal
B．regular
C．average
D．ordinary
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