问题 单项选择题 A1/A2型题

关于细胞免疫,下列错误的是()。

A.T细胞介导,巨噬细胞参与

B.致敏Tc细胞介导细胞毒作用

C.由TD抗原引起

D.CD3传递活化的第一信号

E.抗体-肽-MHC复合物传递活化的第二信号

答案

参考答案:E

解析:杀伤T细胞(TC)的活化也需要双信号,即TCR与靶细胞膜上MHC类分子与抗原肽分子复合物结合后,可通过CD3复合分子传递第一信号。故选E。

阅读理解

阅读理解。

     Having Fun "Growing" and "Stealing"? Recently, an Internet game has become a new fashion among

young office workers and students. People can "farm" on a piece of "land" and "grow", "sell" or even "steal"

"vegetables", "flowers", and "fruits" on the Net. They can earn some e-money and buy more "seeds", "pets",

and even "houses". Joyce interviewed some young people. Here are their opinions.

Harold: I don't quite understand why they are mad about the childish game. Maybe they are just not confident

            enough to face the real world.

Allan: I enjoy putting some "bugs" in my friends' gardens and we've become closer because of the game. 

          Having fun together is the most exciting thing about it.

Laura: You know, people in the city are longing for (渴望) the life in the countryside. It reduces my work

            pressure (压力); Besides, it gives me the exciting experience of being a "thief".

Ivy: Well, it's just a waste of time. Teenagers playing the game spend so many hours on it that they can not

       focus on (专注于) their study.

1. According to the passage, people can't ______ things in this game. [ ]

A. grow

B. borrow

C. steal

D. sell

2. Among the people Joyce interviewed, ______ likes the game while ______ dislikes the game. [ ]

A. Laura; Allan

B. Allan; Harold

C. Harold; Ivy

D. Ivy; Allan

3. From Laura's words, we can guess that she is most probably ______. [ ]

A. a student

B. an office worker

C. a farmer

D. a thief

4. Which is NOT the reason why people like the game? [ ]

A. They are longing for country life.

B. They can have fun with friends.

C. The game can relax people and give them a new experience.

D. They are confident enough to face the real world.

5. Where can you find this passage? [ ]

A. In a car magazine.

B. In an advertisement.

C. In a newspaper.

D. In a science book.

不定项选择题