单项选择题

If a adder hears you approaching, it will usually ______.

A．move out of your path
B．take no notice of you at all
C．disappear very quickly
D．wait until you are close and then attack
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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
C．not worry about the victim
D．operate as soon as possible
单项选择题
We are told that adders are ______.
A．normally friendly towards people
B．unlikely to bite except in self-defense
C．aggressive towards anyone in their territory
D．not afraid of human beings
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