单项选择题

If an adder hears you coming, it will usually ______.

A．take no notice of you at all
B．attack you before moving away
C．wait until you are close and then attack
D．move out of your path
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单项选择题
We are told that adders are ______.
A．normally friendly towards people
B．unlikely to bite except in self-defence
C．fond of attacking anyone in their territory
D．not afraid of human beings
单项选择题
If you are with someone who is bitten by an adder, you should ______.
A．try to catch the adder
B．make no attempt to treat the bite by yourself
C．not worry about the victim (受害者)
D．operate on him as soon as possible
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