问题 填空题 案例分析题

镰刀形细胞贫血症患者的血红蛋白多肽链中,一个氨基酸发生了替换。下图是该病的病因图解。回答下列问题:

已知谷氨酸的密码子为GAA或GAG,组氨酸的密码子为CAU或CAC,天冬氨酸的密码子为GAU或GAC,缬氨酸的密码子为GUA、GUU、GUC或GUG。图中氨基酸甲是();氨基酸乙是()

答案

参考答案:谷氨酸;缬氨酸

阅读理解

阅读理解。

        A Japanese girl learned English in the classroom for two and a half years, and she al-ways wanted to visit London. Now she arrived there at last. When she went out of the station,she didn't know the way to

the hotel,so she asked a policeman standing at the station gate. She spoke slowly and clearly. But to her

surprise, he didn't understand her at all. She asked the same question again and again and then the

policeman understood at last. He answered her,but she didn't know what he was saying, Her teacher

never spoke English like that " I'm a Japanese. I'm new here. "the girl said. The policeman spoke more

slowly than before,and she listened very carefully. but still she couldn't understand him. They looked at

each other and smiled. Then he said something she understood. "You'11 soon learn English !" Then she

knew that the English she had learned was quite different from the English people speak !

1. How many years did the Japanese girl learn English in the classroom?

A. Half a year.      

B. For two years

C. For a halt year.    

D. For two years and a half.

2. How did the Japanese girl get to London?

A. By train.  

B. By ship.  

C. by plane.    

D. By car.

3. Why did the girl ask the policeman?

A. Because she couldn't speak-English.

B . Because she wanted to know the way to the hotel.

C. Because she lost her things.

D. Because she was afraid in a new place.

4. Why was the girl surprised in that city?

A. The policeman didn't understand her at all.

B. She couldn't speak English freely.

C. The policeman under-stood her at last.

D. She asked the same question again and again.

5. What can we learn from the story?

A. The policeman spoke bad English. The girl's English was not good enough.

B. The policeman didn't know the way to the hotel.

C. The girl's English was not good enough.

D. 'There are no good teachers in Japan.

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