单项选择题

"In our society the razor of necessity cuts close" in the first line means ______.

A．there is a shortage of daily necessities
B．people fight each other for necessities
C．most people feel the financial pressure
D．everyone lives a hard life

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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

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