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
<上一题 目录 下一题>
热门 试题

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
单项选择题
I got a new battery for my recorder only last week, but it seems to have ______ already.
A．worn out
B．run down
C．knocked off
D．gone off
相关试题