题目

家蚕结黄茧和白茧由一对等位基因Y、y控制，并受另一对等位基因I、i影响。当基因I存在时，基因Y的作用不能显现出来。现有下面两组杂交实验，请回答下列问题：（1）基因Y与基因I在染色体上的位置关系是_________。（2）实验一F1白茧的基因型是________，实验二F1中的白茧纯合子的基因型是___________。（3）若实验一中的F2中结黄茧个体自由交配，后代中纯合子所占比例为___________（用分数表示）。（4）现有一类型家蚕与实验一的F1基因型相同，将该类型 听力 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。 M：How many students passed the College English Examination last term? W：Well, let me see．1060 students took the exam, but half of them failed． 1．How many students did the woman believe had passed the examination? A．1060． B．1016． C．530． W：Look here, darling．The paper says people tend to feel unwell if they sleep less than six hours a day． M：That may be true for you, but it certainly isn’t true for me． 2．What can we conclude from the man’s reply? A．He wants to have more sleep． B．His wife doesn’t sleep well． C．He doesn’t need as much sleep as his wife． W：Did you see last night’s film on Channel 4? M：Well, I meant to see it, but a friend of mine came to see me．We had a nice long talk about our school days． 3．What did the man do last night? A．He watched TV with his friend． B．He stayed at home talking with his friends． C．He went to see a film with his friend． M：Congratulations! I understand you’ve got a job．When will you start to work? W：You must be thinking of someone else．I’m still waiting to hear the good news． 4．What does the woman mean? A．She doesn’t need the job． B．She hasn’t got a job yet． C．She has got a job． W：What can I do for you, gentleman? Maybe you like this suit, because the color matches your skin and it is the latest fashion． M：Yes, it’s really a good suit and it’s a good color．But I just walk around and watch．Thank you just the same． 5．What did the man accept? A．The color． B．The suit． C．Nothing． 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6～8题。 W：Lovely day, isn’t it? M：Oh yes, beautiful． W：You’re not English, are you? M：No, I’m from Italy．But my mother was born and brought up in England． W：How long have you been learning English? M：For three years now． W：For three years? Goodness me! Your English is very good． M：Thank you．But there’s still a lot more for me to learn． W：How long are you going to stay in this country? M：Another two months．Then I’ll have to go back to Italy to start work． W：A cousin of mine went to Italy last year．He’s an engineer, you know． M：Really? What did he think of Italy? W：He must like it very much, because he hasn’t come back yet．I hope you’ll also enjoy your stay in England． M：Thank you．I’m sure I will． 6．What nationality is the man? A．Italian． B．Greek． C．English． 7．When will the man go back home? A．In half a year． B．In about two months． C．In three years． 8．What does the woman’s cousin do? A．He is visiting all parts of Italy． B．He works as an engineer． C．He is learning English there． 听第7段材料，回答第9～11题。 GIRL：Hello．Is that Uncle George? Where are you? Wait a minute, please．I’ll call Mother, it’s Uncle George． W：George, dear．Where are you? At the corner of Pine and State Street? Wait there．Michael can come and get you． M：No．It’s not necessary．We drove the car．Give me the directions．I’ll find my way． W：Go north on State Street to Main Street．There’s a large square there．Turn left．Continue to King Road．Turn right．Continue on King Road to Seventh Street．Turn left．We’re in the middle of the block．Can you repeat the directions, George? M：I think so．I have to go north on State Street to Main Street．I turn left to King Road, I continue on King Road．I turn right to Seventh Street．I turn left and go to the middle of the block． W：That’s it．I’ll see you soon, George．Mary, is the table set? GIRL：Yes, Mother．Come and look． W：It looks very pretty．Thank you, Mary． 9．What are Mother and Mary doing when Uncle George calls? A．They are going to get Uncle George． B．They are preparing the dinner． C．They are setting a table． 10．Who answers the telephone? A．Mary． B．Mother． C．Uncle George． 11．Where do Mary and her mother live? A．At King Road． B．At Main Street． C．In the Middle of the block． 听第8段材料，回答第12～14题。 W：Christmas is coming near．Li Ming, would you allow me to ask you a question? M：Go ahead． W：Do you celebrate Christmas in your country? M：It all depends．Most Chinese people don’t celebrate Christmas, but now in many big cities people begin to do． W：Oh, I see．But in the west it is the biggest holiday of the year．Everyone is busy shopping to get presents for friends and relatives before Christmas Eve． M：That sounds exciting． W：Children hang stockings in Christmas trees so that Santa Claus can put some candy and toys into them． M：Really?I can’t imagine it． W：In fact, it’s a kind of celebration． 12．Do people in the man’s country celebrate Christmas? A．People in the countryside do． B．People in many big cities do． C．All the people do． 13．What do people in the west do before Christmas Eve? A．Buying presents for friends and relatives． B．Staying at home watching TV． C．Going to the supermarkets to buy daily goods． 14．Why do children hang stockings in Christmas trees? A．Their parents will give them new pairs． B．Santa Claus can put candy and toys in them． C．Santa Claus and toys can sleep in them． 听第9段材料，回答第15～17题。 M：Please, I’d like a ticket to Chicago． W：For today? M：No, early Monday morning． W：We have a flight that will put you there at 9 a. m., is that OK? M：Nothing earlier? I have an appointment at 8∶30． W：I’m afraid not, unless you want a night flight． M：A night flight? W：Yes, with Northwest Airlines．It will get you there bright and early, at 6∶45 a. m. in fact．Is that too early? M：I guess that will be OK．What’s the difference in price? W：Better price．The night flight is cheaper．One way or round trip? M：One way．Sounds good．I’ll take it．Sixty-two fifty you said? W：Sixty-three seventy-five with tax．The flight number is 302 at Gate Five, Kennedy Airport． M：I’ll be there on time． W：Thank you, Mr．Li．Check-in time is one hour before take-off．Have a good trip． 15．Which flight will the man take? A．A night flight． B．An early morning flight． C．A flight from Chicago． 16．What is the plane’s arrival time? A．6∶45 a. m． B．8∶30 a. m． C．3∶02 p. m． 17．What conclusion can we draw? A．There’s only one flight to Chicago． B．A night flight is cheaper than a regular day-time flight． C．Check-in time is after take-off． 听第10段材料，回答第18～20题。 　　This topic is about greeting in China．A few years ago, people would greet each other with the words “Have you had your breakfast or lunch or supper?” “Yes, how about you?” Then politely, both would leave with a smile on their faces． 　　This kind of greeting tells us what people cared about many years ago．For many years, having enough to eat was the most important thing for the Chinese people．The life of most people in China has become much better now．They do not worry about their food and clothing any more．The greeting has changed to “What are you going to do?” or “Where are you going?” 　　Though the greeting has no other meaning than saying hello, it often puzzles other people who are not familiar with China．Nowadays, more and more people are using “How are you?” to greet each other．It is certainly the best way for people to say hello to each other． 18．What did people mostly care about many years ago? A．Are you full or hungry? B．Where are you going? C．Good manners． 19．What does the change of greetings in China show? A．People are less polite to each other． B．People have bad manners now． C．People’s life is better． 20．Which is the best way for people to say hello to each other? A．How do you do? B．How are you? C．Good morning．