单项选择题

The children cheered up when they saw hundreds of colorful balloons______ slowly into the sky.

A．floating
B．hoisting
C．heaving
D．ascending
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单项选择题
In this factory the machines .are not regulated______ but are jointly controlled by a central computer system.
A．independently
B．individually
C．irrespectively
D．irregularly
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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