问题 单项选择题 A1型题

白细胞向着化学刺激物作定向移动的现象称为()

A.白细胞渗出

B.白细胞游出

C.趋化作用

D.调理素化

E.白细胞吞噬

答案

参考答案:C

解析:趋化作用是指白细胞沿浓度梯度向着化学刺激物作定向移动。这些具有吸引白细胞作定向移动的化学刺激物称为趋化因子。趋化因子具有特异性。不同的炎症细胞对趋化因子的反应不同。最常见的外源性化学趋化因子有可溶性细菌产物,特别是含有N-甲酰基蛋氨酸末端的多肽。内源性趋化因子包括:补体成分(C5a)、白三烯(LTB4)、细胞因子(IL-8)等。

阅读理解
       The City Bank was broken into yesterday at 8 p.m.. The police were questioning two men, John
Smith and his brother Joseph Smith.
       A Policeman Interviewed With John Smith
       John Smith was asked, "What did you do last night?" He answered, "I was with my brother,
Joseph, all the time. I arrived at my brother's house at about 6:45 and we watched TV until about
7:30.We watched the news and a baseball game. Then we walked into the town center and had a
meal at a restaurant. I can't remember the name of the restaurant. It was a big one, but it was almost
empty. We both had fish and chips. We left there at 8:40and walked back to Joseph's house."
       The statement is true.
       Signed: John Smith
       A Policeman Interviewed With Joseph Smith
       Joseph Smith was asked, "What did you do last night?" He answered, "I was with John all the time.
John came to my house at fifteen to seven, and then we watched TV for about 45 minutes. We watched
a movie about a basketball player, but I can't remember the name of the movie. Then we took a taxi to a
restaurant. I forget what the restaurant is called. There were not many people was almost empty. on both
had fish and chips. We left there at twenty to nine and we went back to my house."
       The statement is true.
       Signed: Joseph Smith
                         
1. The policeman wanted to find the person who               .
A. told a lie                            
B. knew the thief
C. went into the bank                    
D. stoic the baseball
2. John and Joseph are              
A. boss and worker
B. workmates
C. policeman and thiefD. brothers
3. The two men told the police the same thing about              .
A. how they got to the restaurant
B. the time
C. what they ate
D. the TV programs
4. Neither of the two men             .
A. ate at a restaurant last night          
B.  watched a movie on TV
C. knew the name of the restaurant      
D.  liked to eat chips
5. Which is NOT TRUE according to their statements?
A. Joseph got to Join's house at 6 : 45 p. m..
B. There were only a few people in the restaurant.
C. They watched TV for about 45 minutes,
D. They went back to Joseph's house after leaving the restaurant.
单项选择题