问题
单项选择题
在两对相对性状的遗传实验中，可能具有1∶1∶1∶1比例关系的是（）
①杂种自交后代的性状分离比
②杂种产生配子类型的比例
③杂种测交后代的表现型比例
④杂种自交后代的基因型比例
⑤杂种测交后代的基因型比例
A.①②④
B.②④⑤
C.①③⑤
D.②③⑤
答案
参考答案：D
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在两对相对性状的遗传实验中，可能具有1∶1∶1∶1比例关系的是（）
①杂种自交后代的性状分离比
②杂种产生配子类型的比例
③杂种测交后代的表现型比例
④杂种自交后代的基因型比例
⑤杂种测交后代的基因型比例
A.①②④
B.②④⑤
C.①③⑤
D.②③⑤
参考答案：D
| 完型填空 | |||
| Many TV programs seem to be quite realistic. One who watches TV often feels that 1 happened in the film may as well happen to him. With only a little 2 , every man in the street may turn 3 to be a thief, or a spy or a murderer. Jane had been watching a spy film at a friend's home, in which a young girl had been 4 and murdered, so she felt a little frightened. She took a train back to the centre of the city. There were a lot of people 5 with her, so she felt much safer. A man sat behind her, reading a newspaper. She thought nothing of it 6 she saw him staring at her. Remembering the film and feeling 7 , she got off the train and went to the bus stop. When the man got on the same bus as she did, she realized he was following her. When she got off the bus, she was getting more and more scared as the street almost became 8 . She walked as quickly as she could. She could hear footsteps behind her, but she didn't dare to look back over her 9 . It seemed to have been hours before she 10 the front door. She felt for her keys, but was 11 to find them. The footsteps stopped behind her. She felt a hand on her shoulder. 12 of feeling hands round her neck, however, she heard a pleasant voice: "I apologize if I frightened you. I thought I 13 you on the train, but I was not sure. I am Michael, are you Jane? We have studied in the same junior school. And I 14 this up on the train. I think it might be yours." The man handed a key to her. "Yes, it is mine. Thanks!" She accepted it and said good bye to him. 15 in the bed, Jane was awake thinking what happened today. "It is so terrifying, surprising though." | |||
| ( )1. A. which ( )2. A. thinking ( )3. A. out ( )4. A. watched ( )5. A. taking ( )6. A. until ( )7. A. excited ( )8. A. crowed ( )9. A. head ( )10. A. got ( )11. A. grateful ( )12. A. Because ( )13. A. knew ( )14. A. took ( )15. A. Laying | B. that B. imagination B. on B. followed B. sitting B. yet B. happy B. busy B. arms B. reached B. successful B. Afraid B. frightened B. picked B. Lying | C. whatever C. consideration C. in C. suspected C. standing C. when C. uncomfortable C. dirty C. shoulder C. arrived C. surprised C. Instead C. recognized C. gave C. Waiting | D. all D. experience D. off D. hurt D. traveling D. as D. unimportant D. empty D. back D. returned D. unable D. Almost D. noticed D. woke D. Touching |