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
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单项选择题
To test his theory, the chemist______an experiment.
A．set up
B．set out
C．set forth
D．set in
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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