题目

在地球大气层外有很多太空垃圾绕地球转动，可视为绕地球做匀速圆周运动。每到太阳活动期，由于受太阳的影响，地球大气层的厚度增加，从而使得一些太空垃圾进入稀薄大气层，运动半径开始逐渐变小，但每一周仍可视为匀速圆周运动。若在这个过程中某块太空垃圾能保持质量不变，则这块太空垃圾    A．运动的角速度逐渐变小         B．地球引力对它做正功 C．受的地球引力逐渐变小         D．机械能可能不变 听力(共两节) 第一节(共5小题) 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 do we know about Bill? A．He will finish the paper soon． B．He’s not going to write the paper． C．He seldom completes his work early． 2．Where does the conversation most probably take place? A．In a hotel． B．In a hospital． C．In an office building． 3．What does the woman want the man to do? A．Carry the box downstairs． B．Put the box in a low position． C．Move the box to the upper shelf． 4．What do we know about the population of the city? A．It has increased． B．It has stayed the same． C．It has decreased． 5．What has caused the sales volume to go down? A．Low production． B．Poor management． C．Foreign competition． 第二节(共15小题) 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 does the woman think of what the man said? A．It is surprising． B．It is discouraging． C．It is unbelievable． 7．What do we know about the clothes the man described? A．They will warm up when it is cold． B．They will cool off when it is cold． C．They have built in－air conditioners． 听第7段材料，回答第8～10题。 8．What are the two speakers mainly flying on a plane? A．Air pollution． B．Transportation． C．Road connection． 9．Why does the man think laws of car use will be made? A．Road traffic has to be controlled． B．There’ll be new ways of traveling． C．More and more people enjoy air travel． 10．What does the woman think of traveling by train under the ocean? A．It is exciting． B．It is frightening． C．It is unimaginable 听第8段材料，回答第11～13题。 11．What is the probable relationship between the woman and the man? A．Wife and husband． B．Employer and employee． C．Landlady and renter． 12．What does the woman want the man to do when he goes out? A．Boil the kettle． B．Shut the window． C．Close the drawers． 13．What do we know about the woman? A．She is very careful． B．She is warm－hearted． C．She is absent－minded． 听第9段材料，回答第14～17题。 14．What does the man probably do? A．He’s ticket collector． B．He’s a jeweler． C．He’s a policeman． 15．Where does the conversation most probably take place? A．On a train． B．In the street． C．At the man’s office． 16．Why does the man stop the woman? A．She stole something． B．She is too rude to him． C．She smoked in public places． 17．How does the man act toward the woman? A．Selfishly． B．Wrongly． C．Politely． 听第10段材料，回答第18～20题。 18．What was done to find people’s ideas about the women’s movement? A．A question was asked of husbands． B．A group was set up to interview people． C．A survey was made to both men and women． 19．Who help most at home? A．Danish husbands． B．British husbands． C．Italian husbands． 20．What can we learn from what the speaker said? A．Housework should be shared between men and women． B．More than 50％ of Danish men help in the house． C．Danish men are more afraid of their wives．