英语选修8 外研版module2同步练习题(4—阅读)及答案 .阅读理解 a team of scientists proved that seals (海豹) had a very good sense of hearing. these men trained blind seals to expect food when they heard sounds. the seals always began snapping (猛咬) when a strong signal was sounded. it was proved that even a soft signal, a considerable distance (相当远的距离) away, could make these sea animals respond (起反应). that should make the fishermen who make much noise while working, or talk loudly, start thinking. the same team of scientists also trained seals to recognize different sounds. one belltone meant food, two bellto