单项选择题

It is very plain that such a life as this is far more______to health than that of the man who can afford little leisure for necessary rest in the course of the day.

A．conductive
B．constructive
C．conciliate
D．conducive
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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
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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