问题 选择题

下列依次为丙氨酸、丝氨酸和天门冬氨酸的结构式: 由这三个氨基酸脱水缩合所的化合物中,含有的氨基、羧基和肽键的数目是

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A.1、1、3

B.3、3、2

C.1、1、2

D.1、2、2

答案

答案:D

单项选择题
完形填空

I was parked in front of the mall wiping off my car. Coming my way from across the parking lot was 1  society would consider a bum(无业游民). From the  2 of him, he had no car, no home, no clean clothes, and no money. He sat down in front of the bus stop but didn’t look like he could have enough money to even  3  the bus. “That’s a very pretty car,” he said. He was  4 but he had a(n)  5  of dignity around him. I said, “thanks,” and  6 wiping off my car. He sat there  7  as I worked. The  8  beg for money never came. As the silence between us widened something inside said, “ask him if he needs any help.” I was 9  that he would say “yes”. “Do you need any help?” I asked. He answered in three  10  but profound(深远的) words that I shall never  11 . “Don’t we all?” he said.

I had been feeling high, successful and important  12  those three words  13  me like a shotgun. Don’t we all? I needed help. Maybe not for bus fare or a place to sleep, but I needed help. I  14  my wallet and gave him not only enough for bus fare, but enough to get a warm meal and  15  for the day. Those three little words still ring  16 . No matter how much you have, no matter how much you have 17 , you need help too. No matter how  18 you have, no matter how  19  you are with problems, even without money or a place to sleep, you can  20  help.

1. A. that            B. what            C. which           D. how  

2. A. expressions      B. manners         C. looks          D. attitudes 

3. A. ride             B. buy             C. drive           D. stop    

4. A. generous         B. disappointed    C. modern          D. ragged 

5. A. air              B. atmosphere      C. appearance      D. figure 

6. A. finished         B. stopped         C. continued      D. began 

7. A. quietly         B. casually        C. aimlessly       D. eagerly 

8. A. intenting        B. expected        C. boring         D. supposed 

9. A. afraid          B. glad           C. doubtful       D. sure

10. A. simple         B. complex         C. strange         D. rigid 

11. A. accept           B. forget         C. respond         D. choose  

12. A. unless           B. after          C. until          D. when  

13. A. fightened       B. moved          C. wounded        D. hit  

14. A. reached in      B. searched for    C. looked up      D. exposed to 

15. A. shelter         B. clothes         C. reward         D. blanket 

16. A. nice             B. ridiculous     C. true            D. proper 

17. A. submitted        B. devoted        C. applied        D. accomplished

18. A. few             B. many           C. little         D. enough 

19. A. loaded         B. puzzled         C. angry          D. unsatisfied 

20. A. receive         B. give             C. need           D. seek