问题 多项选择题

关于生物膜下列叙述正确是()。

A.主要成分是蛋白质和脂类

B.蛋白质镶嵌的磷脂双分子层内

C.骨架结构是磷脂双分子层

D.膜脂包括磷脂、鞘脂、胆固醇

E.具有流动性和方向性

答案

参考答案:A, C, D, E

阅读理解

阅读短文,根据短文内容回答问题。

     Recently, an Internet game has become popular among young office workers and students. On the

Internet people can "farm" on a piece of "land" and "grow", "sell" or even "steal" "vegetables","flowers" and

"fruits". They can make some e-money and buy more "seeds"," pets" and even "houses". Of course, all those

are not true, you know, they are on the net!

     I interviewed some young people. Here are their opinions.

     A parent says she doesn't quite understand why they are so mad about the childish games. Maybe they

are just not confident enough to face the real world.

     Many junior high school children say they enjoy putting some "bugs" in her friends "gardens" and they've

become closer because of the game. Having fun together is the most exciting thing.

     Most young office workers think their work is too much for them and wish to relax for a while. Besides,

it gives them the exciting experience of being a "thief".

     But almost all the teachers say it's just a waste of time. Teenagers playing the game spend so many hours

on it that they can not pay attention to their study.

1. Is it true that the Internet game has become popular?

    ___________________________________________________

2. Who enjoy the game better, young people or old people? 

    ___________________________________________________

3. Why do junior high school students like playing the game? 

    ___________________________________________________

4. Why do parents and teachers dislike the game? 

    ___________________________________________________

5. What is the writer's purpose of telling us that? 

    ___________________________________________________

多项选择题