题目

用镁、氧化镁、氢氧化镁、硫酸溶液、硫酸铜溶液五种物质两两进行反应，能得到硫酸镁的方法有（    ） A. 3种    B. 4种    C. 5种    D. 无法确定 答案：B     听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。1. What can we learn from the conversation ?A. The concert is on December 24 th.B. The man hasn’t got the ticket for the concert.C. Na Ying is going to sing two songs together with Sun Nan.2. How much does the man charge the woman in the end ?A. $5.05.B. $25.C. $25.053. What’s the woman’s phone number ?A. 3386579.B. 3387956.C. 3385679.4. Who is Fidel probably ?A. It is Mary’s pet.B. It is Mary’s baby.C. It is George’s pet.5. Where does the conversation take place ?A. At a booking office.B. On a plane.C. At an airport.