[单项选择]By far the most common snake in Britain is the adder(奎蛇). In Scotland, in fact, there are no other snakes at all. The adder is also the only British snake with a poisonous bite. It can be found almost anywhere, but prefers sunny hillsides and rough open country, including high ground. In Ireland there are no snakes at all. Most people regard snake bites as a fatal(致命的)misfortune, but not all bites are serious, and very few are fatal. Sometimes attempts at emergency treatment turn out to be more dangerous than the bite itself, with amateurs(外行人)heroically, but mistakenly, trying do-it-yourself surgery(手术)and other unnecessary measures. All snakes have small teeth, so that all snakes can bite, but only the bite of the adder presents any danger. British snakes are shy animals and far more frightened of you than you could possibly be of them. The adder will attack only if it feels threatened, as can happen if you take it by surprise and step on it accidentally, or if y
A. normally friendly towards people
B. unlikely to bite except in self-defense
C. likely to attack people whenever they see them
D. not afraid of human beings

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