单项选择题

A really powerful speaker can ______ the feelings of the audience to the fever of excitement.

A．work out
B．work over
C．work at
D．work up
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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
单项选择题
What ______ do the health authorities take to prevent the spread of epidemic
A．steps
B．plans
C．paces
D．grounds
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