题目

Old George bought the black gloves for just $35 ten years ago. They were made of lamb skin, soft and warm and very strong. Until then, he had worn cheaper man-made material. Those gloves never lasted longer than three years. He first decided to buy the expensive gloves, because they would make him feel nice in front of others. George never let a drop of water or rain touch his expensive gloves, so they looked new. Losing this favourite thing was almost like losing a child to him. Bad luck! George lost his expensive gloves on New Year's Day. Back home. George was at a loss. In deep winte下面关于超声波或超声波的利用的说法中，不正确的是 A．蝙蝠能发出超声波; B．超声波的传播不需要介质; C．可以利用超声波的反射探测海洋深度; D．可以利用B型超声仪检查身体.