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
She claims to be very learned in biochemistry, but in fact ______ she knows about it is all sadly out of date.
A．so little
B．that much
C．what little
D．how much
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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