题目

已知双曲线kx2-y2=1(k>0)的一条渐近线与直线2x+y-3=0垂直,则双曲线的离心率是( ) (A)   (B) (C)4  (D) 答案：A. 听力测试(共20小题；每小题1分，共20分) 第一节 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．Why doesn't the man tell the woman the way to the hospital? A．Because he is a stranger to the city． B．Because he doesn't want to tell her the way． C．Because he doesn't feel like talking with her． 2．Where are the two speakers? A．They are in an office． B．They are in the street． C．They are at home． 3．Why doesn't the man lend his dictionary to the woman? A．Because he is using it． B．Because he hasn't brought it with him． C．Because he doesn't want to lend it to the woman． 4．What does the woman want to borrow from the man? A．A dictionary． B．A pan． C．A rubber． 5．What does the woman offer to do? A．To wash some clothes for the man． B．To carry his box． C．To look after his child． 第二节 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．What are the two speakers talking about? A．English． B．Hobby． C．Weather． 7．What is Peter worried about? A．English people． B．His English． C．Going out． 听第7段材料，回答第8～10题。 8．When is Mary's birthday? A．On August 15th． B．On August 16th． C．On August 12th． 9．What time will the party begin? A．At 2∶00 p. m． B．At 2∶20 p. m． C．At 1∶40 p. m． 10．Will Jean come to the party? A．No, she won't, because she'll meet her sister at the station． B．Yes, she will, but she will be late for the party． C．Not sure．Perhaps she won't be able to come． 听第8段材料，回答第11～13题。 11．Where are the speakers? A．At a museum． B．In a shop． C．In a school． 12．What are they talking about? A．A country． B．China． C．A gun． 13．How long has the man worked here? A．Two years． B．Five years． C．Ten years． 听第9段材料，回答第14～16题。 14．What's the relationship between the two speakers? A．Mother and son． B．Teacher and parent． C．Doctor and patient． 15．Who probably thought it was much worse than it really was? A．The child． B．The mother of the boy． C．Everyone there． 16．What's the matter with the man? A．He has a headache and feels bad． B．He is frightened at the blood． C．He hurt himself on the head． 听第10段材料，回答第17～20题。 17．What was the young father doing? A．He was looking after his child． B．He was paying a visit to an old neighbor． C．He was working with an old neighbor． 18．What were they talking about? A．Children B．Their houses． C．Their trees． 19．Why did the young tree bend over to one side? A．Because it was pulled by a string． B．Because it was dying． C．Because it was too thin to stand straight alone． 20．What did the young father learn from the old man? A．He needn't be strict with children． B．He learned how strict parents should be with their children． C．He learned how to plant a tree．