题目

在下列所示的遗传系谱图中，不可能为伴性遗传的是A. ①③ B. ②④ C. ①④ D. ②③ 答案：【答案】B【解析】①该病是隐性遗传病，致病基因可能位于常染色体上，也可能位于X染色体上，①错误；②由于双亲患病，生有正常的孩子，因此该遗传病是显性遗传病，由于男患者的女儿正常，因此致病基因不可能位于X染色体上，②正确；③该病可能是显性遗传病，也可能是隐性遗传病，致病基因The English are often described as unfriendly people who don’t talk to strangers（陌生人）. But not London taxi drivers. I once asked one cabby to describe his life to me and he didn’t stop talking until I arrived home half an hour later. He told me many interesting stories and this is one of them. “Some strange things happen late at night. The other day I was taking a woman home from a party. She had her little dog with her. When we got to her house, she found that she’d lost her key. So, I waited in the cab with her dog while she climbed in through the window.” “I waited and waited. After half an hour of ringing the bell I decided to find out what was going on. I tied the dog to a tree and started to climb in through the window. The next thing I knew was that the police came. They thought I was to rob the house! Luckily, the woman came downstairs. She’d gone to sleep and forgotten about me and the dog. I was in such a hurry to get away that I forgot to ask her for the fare.” 1. What does the writer think of the London taxi driver? A.They are unfriendly. B.They like to talk to strangers. C.They talk too much. D.They are not English. 2. From the passage, we know_________. A. the writer is the taxi driver’s friend B. the writer often travels by taxi C. the writer is a foreigner visiting London D. the writer lives in London 3. What does “cabby” mean? A. Taxi. B. Stranger. C. Taxi driver. D. Londoner. 4. Why did the taxi driver wait for the woman? A. Because she had left her dog with him. B. Because she had not paid him. C. Because she wanted to go out again. D. Both A and B. 5. Why do you think the woman didn’t go out of the house again. A. Because she didn’t want to pay the taxi driver. B. Because she was so tired that she had forgotten about the taxi driver. C. Because she wanted to keep the taxi driver waiting. D. Because she wanted to go to sleep first.