单项选择题

You may conclude from this article that it is _______ using machines to make a person breathe for years if his brain is dead.

A．a clever way
B．a wise way
C．no use
D．quite useful
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单项选择题
Someone who is hurt badly and is unconscious ______ pain.
A．must feel
B．feels no
C．sometimes feels
D．probably feels
单项选择题
— Can you help me—_________.
A．No, I don't know.
B．Don't mention it.
C．Sure, What is it
D．That's it.
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