单项选择题

All the references she has obtained for her doctoral dissertation ______ about twenty items.

A．make up for
B．add up to
C．come up with
D．put up with
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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
单项选择题
With prices ______ so much, it is impossible for the company manager to stick to the original budget.
A．waving
B．swinging
C．fluctuating
D．vibrating
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