单项选择题

The recording of eye-movements during sleep is ______.

A．a kind of experiment
B．to know how to deal with eye-movements
C．an unusual and dangerous recording
D．to know the exact time when eye-movements happen
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单项选择题
I don't think Jason's serious about going to Africa,______
A．don't he
B．don't I
C．will you
D．is he
单项选择题
Many a way ______ tried already.
A．has been
B．are
C．being
D．have
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