问题 选择题

下列事实及现象与胶体无关的是 (    )

A.2013年1月9日以来,全国中东部多个地区发布雾霾黄色甚至橙色预警,同时多个地区pm2.5严重超标。

B.将食盐晶体研磨成纳米级的细小颗粒,加入足量水中,可形成均一、稳定的分散系

C.一束平行光线射入氢氧化铁胶体里,从侧面可以看到一条光亮的通路

D.在金属、陶瓷、聚合物等材料中加入固态胶粒,可以改进材料的机械性能及光学性质

答案

答案:B

题目分析:胶体是指分散质粒子直径在1nm—100nm之间的分散系,是一种高度分散的多相不均匀体系,可以用丁达尔现象分辨胶体和溶液。食盐溶液不属于胶体,故与胶体无关。

阅读理解

阅读理解。

     "I look at the beauty of the clothes firstly and then style and fit come second. Price is never really

something that I consider,”  says Augustine Masilela, a owner of a kids' clothing shop.    

     For Masilela, there is no limit (限制) to the amount she will take on children's clothes.    

     If she thinks the quality and style are great, she will take it. 

     Sonia Motaung does not mind throwing a few fashionable numbers into her seven-year-old kid's

wardrobe(衣柜).      

     "I believe a child should keep a child. She must still be able to play but not look careless, " she

says.      

     Some parents say boys are difficult to shop for.     

      " To make my son look good , I dress him in designer labels (栎签) , "  says Kgomotso  

Mogotlane.     

     She says shopping for her three-year-old boy can be a null thing, but she has thought of lots of ways to make it fun.      

     While it is often a parent that decides on a child's wardrobe, some mothers let their kids choose.      

     "I go shopping with my four-year-old son and let him choose what he wants, " says Uyanda Mbuli.      

     Of course, when they reach a certain age, children start choosing their own coats.      

     "I like to go with my mother when she buys my clothes because then I can choose what I want, " says

Sipho Mdluli( 12) .      

     Whether it's the kids who choose what they want to be seen in or their parents who take the lead,

children are surely looking cool.

1. Masilela pays more attention to the clothes' ________ first when she wants to buy one.    

A. price    

B. beauty    

C. fit        

D. style

2. Who often goes shopping with her/his kid?    

A. Motaung.              

B. Mogotlane.    

C. Mbuli.                

D. Masilela.

3. The last paragraph shows kids want to wear ______ clothes.    

A. expensive            

B. comfortable

C. fashionable            

D. Cheap

多项选择题