题目内容

实验中双刀开关的作用是，可以减少误差。

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实验中RN代表电阻。

_______useful book it is！

A．What an
B．How a
C．What a
D．What

One afternoon he found _handbag．There was “s” on the corner of __ handbag．

A．a；an；the
B．a；a；the
C．an；an；an
D．the；a；a

woman over there is popular teacher in our school．

A．A；an
B．The；a
C．The；the
D．A；the