第2题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. To meet a friend at the airport. B. To talk with a friend. C. To visit a friend on his way. D. To visit a patient in a hospital. 参考答案:B 答案解析:[听力原文]
M: Hi, Joan, I was just around and I thought I would drop by.
W: What a pleasant surprise!
第10题: [单项选择]有一条400米长的环形跑道,甲、乙两人骑车从A点出发,背向而行。甲的初始速度为1米/秒,乙的初始速度为11米/秒。每当两人相遇,甲的速度就增加1米/秒,乙的速度减少1米/秒。那么当两人以相等的速度相遇时,距离A点多少米 A. 50 B. 60 C. 75 D. 100 参考答案:D 答案解析:[解析] 此题为环形相遇问题,由于每次相遇路程相同,s=400米,速度和均为1+11=12米/秒,因此每次相遇时间都等于400÷12秒。两人速度相等时均为6米/秒,甲骑行总路程为400÷12×(1+2