单项选择题

Most insulation devices of this kind,______manufactured for such purposes, are extremely expensive to install.

A．that are
B．which is
C．those are
D．as are
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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
The manager threw a party______the group of computer experts from the Unit ed States.
A．in honor of
B．in favor of
C．in welcome of
D．in celebration of
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