题目

  ______ that Anne was at the spot when the car hit the old man, so she saw everything. A. It so happened   B. What turned out   C. That ended up   D. It added up 答案：A下列不是利用回声定位的是A.海豚发现前面游动的潜水员B.雷达发现敌机C.利用声呐捕鱼D.利用超声波洗牙