【单选题】By far the most common snake in Britain is the adder. 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 any...
【简答题】Directions: Fill in the blanks with the words or phrases given below, change the form if necessary. (P72) universal wander barrier by a small margin threaten feature civ...