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

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热门试题

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

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