问题 选择题

溶液、胶体和浊液的本质区别是

A.是不是大量分子或离子的集合体

B.分散质微粒直径的大小

C.能否通过滤纸或半透膜

D.是否均一、稳定、透明

答案

答案:B

溶液、胶体和浊液的本质区别是分散质微粒直径的大小;当分散质粒子直径在1nm~100nm之间为胶体,大于100nm的为浊液,小于1nm的为溶液;

多项选择题
阅读理解

阅读理解

     Have you ever heard the old saying, "Never judge a book by its cover."? This is a good rule to

follow when trying to judge the intelligence of others. Some people have minds that shine only in

certain situations. A young man with an unusual gift in writing may find himself speechless before a

pretty girl when he speaks. He may not be able to find the right words. But don't make the mistake

of thinking him stupid. With a pen and paper, he can express himself better than anybody else.

    Other people may fool you into overestimating(过高估计) their intelligence by putting up a good

front. A student who listens attentively and takes notes in class is bound to (一定会) make a favorable

impression on his teachers. But when it comes to exams, he may score near the bottom of the class.

    In a word, you can't judge someone by appearance. The only way to determine a person's intelligence

is to get to know him. Then you can see how he reacts to different situations. The more situations you

see, the better your judgment is likely to be. So take your time. Don't judge a book by its cover.

1. The passage suggests that ______.   

A. a good writer may not be a good speaker    

B. a good writer is always a good speaker 

C. a speechless person always writes well    

D. a good writer will find himself speechless

3. According to this passage, a student who listens attentively and takes notes in class ________.            

A. is an intelligent student 

B. may not be an intelligent student 

C. will score better in exams 

D. will not be a good student

3. The passage suggests that we should judge a person's intelligence through ______. 

A. his teachers                      

B. his deeds in the classroom 

C. his appearance                    

D. his reactions to different situations

4.  The writer of this passage wants to tell us not to______.    

A. judge a book by its cover 

B. make the mistake of thinking a young man stupid 

C. overestimate a student's intelligence 

D. judge a person's intelligence by his appearance