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
Linda's stubbornness______ her in relationships with other people and she always turns a deaf ear to everything.
A．affirms
B．clutches
C．deems
D．hinders
单项选择题
He has failed me so many times that I no longer place any______ on what he promises.
A．fate
B．morality
C．confidence
D．reliance
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