试题题干
Translate the following sentence into Chinese.
Pigeons have been known to fly as fast as 75 miles an hour and to cover distances of 500 to 600 miles.
参考答案
试题解析
考点：be known to众所周知；as fast as···以···速度飞行；cover distances of···达到····的距离。
句子结构：句子主干为Pigeons have been known to fly，as fast as···和to cover distances···为状语。