题目

一个密闭容器中加入甲、乙、丙、丁四种物质，在一定条件下发生化学反应，测得数据见表．下列说法中不正确的是（ ） 物质甲乙丙丁 反应前质量8g35g5g8g 反应后质量2gX5g42g A．X=7g B．在该反应中，丙物质一定为催化剂 C．该反应类型是化合反应 D．参加反应的甲物质的质量为6g 答案：【考点】质量守恒定律及其应用；催化剂的特点与催化作用；反应类型的判定． 【分析】反应后甲的质量减少6g，是反应物； 反应后丙的质量不变，可能是催化剂，也可能既不是反应物，也不是生成物； 反应后丁的质量增加34g，是生成物； 根据质量守恒定律可知，乙是反应物，参加反应的质量为：34g 听力(共两节，满分20分) 第一节(共5小题；每小题1分，分) 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。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 does the woman want to do? A．Have a cup of coffee． B．Take a walk with the man． C．Go back to her office． 2．What time is it according to the woman? A．9∶50． B．10∶10． C．10∶50． 3．What exam will the man have on Thursday? A．An English exam． B．A math exam． C．A history exam． 4．How will the man probably go to Main Street? A．By bus． B．By taxi． C．On foot． 5．Where is the woman’s father? A．In the hospital． B．At home． C．In the coffee． 第二节(共15小题；每小题1分，满分15分) 听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听第6段材料，回答第6、7题。 6．When is the man’s girlfriend’s birthday? A．Friday． B．Thursday． C．Tuesday． 7．What is the man going to do? A．Take the woman’s suggestion． B．Try other restaurants． C．Cancel his plan． 听第7段材料，回答第8、9题。 8．What does the man’s brother do? A．He is a teacher． B．He is a shop assistant． C．He is a sailor． 9．What do we know about the man’s grandparents? A．They live with the man’s parents． B．They live in the countryside． C．They often go to see the man． 听第8段材料，回答第10至12题。 10．How much is a full price ticket? A．135 Yuan． B．130 Yuan． C．105 Yuan． 11．What do we know about the discount ticket? A．Only certain people can buy it． B．It’s for certain kinds of scenic spots only． C．It’s the cheapest of the three types of tickets． 12．What would the man like to do? A．Visit all the scenic spots in the area． B．Visit single scenic spots in the area． C．Enjoy a discount with his student card． 听第9段材料，回答第13至16题。 13．Why is the man sometimes surprised after running? A．He comes up with solutions for his problem． B．He runs so long without realizing it． C．He doesn’t know where he has been． 14．What will the man do next year? A．Attend a course． B．Take part in a running race． C．Go ice-climbing． 15．How long is the London Marathon? A．26 kilometers． B．32 kilometers． C．42 kilometers 16．What happened to the man’s wife when they went mountain climbing? A．She was exhausted． B．She felt ill． C．She fell down． 听第10段材料，回答第17至20题。 17．Why do Polish(荷兰的)people start work every early in the morning in summer? A．To have more free time． B．To earn more money． C．To avoid the sun． 18．What do the Polish show great interest in? A．Sports． B．Arts． C．Business． 19．Why are there often crowds of people at the door of the theater? A．They are watching a free performance． B．They are waiting to go into the theater． C．They are waiting for available tickets． 20．How many days of vacation do many Polish people have each year? A．About 10 B．About 20． C．About 30．