单项选择题

Humans, like many other animals, are warm-blooded with a fairly constantly body temperature.

A．Humans
B． like
C． with
D．fairly constantly
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单项选择题
You see the lightning （） it happens, but you hear the thunder later.

A．the instant
B．for an instant
C．on the instant
D．in an instant
单项选择题
Your hair wants ______. You’d better have it done tomorrow.
A．cut
B．to cut
C．cutting
D．being cut
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