题目

An eight-year-old child heard her parents talking about her little ___1______ All she knew was that he was very sick and they had no money left. When she heard her daddy say to her 2         mother with whispered desperation（绝望）, Only a miracle（奇迹） can save him now, the little girl went to her bedroom and took out her piggy bank. She poured all the change out on the floor and counted it carefully. Then she   3      her way six blocks to the local drugstore（药店）. And what do you want? asked the chemist.     It’s for my little brother, the girl answer18．一列客车以10m/s的速度行使，突然迎面开来一辆以20m/s的速度行使的长300m的货车，那么坐在窗口的乘客看见货车从眼前通过的时间是（　　）A．10sB．15sC．20sD．30s