何谓细胞外被?它有哪些功能?

题型:问答题 简答题

问题:

何谓细胞外被?它有哪些功能?

考点:生物学细胞质膜细胞质膜题库
题型:问答题 简答题

已知○÷△=□,下列算式正确的是[ ]

A.△÷○=□    

B.△×□=○    

C.○×△=□

题型:问答题 简答题

阅读理解。

     To me, music is food and water.I can't live without it.I know this is not true for everybody.Many

people don't listen to music and they can get along quite well.But music is everywhere in our life.For

example, when you watch films or TV plays,do you find them interesting if there is no music?You

would find them boring.And when you are waiting for the train or the plane,you would like music

because it makes the time seem shorter.

     It is true that music is everywhere in our life.Some people like to sit by the sea and listen to the

sound of the sea.Some enjoy listening to the singing of birds.Those sounds are some kinds of music.  

So music has meaning for everyone in some way or other.Of course, it has special meaning for people

like me.We spend our lives playing or writing music.

     Someone said,"Though music a child goes into a world of beauty, learns to take care of others

and makes his mind and body strong."Music is an important part of our lives.

1.The passage tells us that the writer _______.

A. likes to sit by the sea            

B. is not interested in music

C. likes to travel by plane          

D. likes music very much

2.The word "boring" in the first paragraph means ______.

A. interesting            

B. not interesting

C. tiring                

D. foolish

3.Music is important to _______.

A. some people        

B. everyone      

C. nobody  

D. writers only

4.Listening to music can ______ when you are waiting for the train.

A. make time fly quickly  

B. help you save time

C. make time short      

D. make you feel time passes more quickly

5. Which of the following is true?

A. The writer likes to write music every day.

B. The writer becomes strong through music.

C. Most people like to listen to the sound of the sea. 

D. Music has some kind of meaning to everyone.

题型:问答题 简答题

世界上淡水资源最丰富的地区是[ ]

A.中东地区

B.南极地区

C.北极地区

D.欧洲西部

题型:问答题 简答题

对机动车驾驶人违反交通安全管理的违法行为,其违法记分有几个档次?每个档次的记分分值是多少?

题型:问答题 简答题

可能用到的相对原子质量:
H-1 He-4 C-12 N-14 O-16 S-32 Fe-56

高中化学课程分为必修、选修两类。其中,必修包括2个模块;选修包括6个模块,是必修课程的进一步拓展和延伸。每个课程模块______学分、______学时。______

A.3、36
B.2、36
C.3、48
D.2、48

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