Every chemical change either results from energy being used to produce the chang

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

选项 A、given off
B、put out
C、set off
D、used up

答案 A

解析题意是：每次化学变化或者来源于能量被用来产生这种变化，或者促使能量以某种形式而被______。 [A] given off“释放，发出”，符合题意。 [B] put out“熄灭，扑灭”，[C]setoff“出发，启程”，[D]used up“用完，用光”都与题意不符。

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Coalhasbeen______bynaturalgasasamajorsourceofenergy.A、displacedB、de