单项选择题

When solid changes to liquid, it ______ heat from all substances near it and this reduces the temperature surrounding it.

A．takes in
B．takes on
C．takes off
D．takes down
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单项选择题
To test his theory, the chemist ______ an experiment.
A．set up
B．set out
C．set forth
D．set in
单项选择题
After so many nights of ______, Mrs. Constable decided that she really must see a doctor. She could not continue to lie awake, night after night, worrying about her health.
A．parties
B．frightening dreams
C．sleeplessness
D．loneliness
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