问题 填空题

下列各组物质的分离或提纯,应选用下述方法的哪一种?(填序号)

A.分液 B.过滤 C.萃取 D .蒸馏 E .蒸发结晶 F.加热分解

(1)除去Ca(OH)2溶液中悬浮的CaCO3                    ;

(2)从碘水中提取碘                 

(3)用自来水制取蒸馏水                ; 

(4)分离植物油和水               

(5)除去NaCl中所含的少量KNO3               

(6)除去CaO中少量的CaCO3                 ;

答案

(1)B

(2)C

(3)D

(4)A

(5)E

(6)F

阅读理解

阅读理解。

     Mrs Brown had a small garden behind her house and in the spring she planted some vegetables in it.

She looked after them very carefully, and when the summer came, they looked very nice.

     One evening Mrs Brown looked at her vegetables and said, "Tomorrow I am going to pick them and

we can eat them."

     But early the next morning, her son ran into the kitchen and shouted, "Mother, Mother! Come

quickly! Our neighbour's ducks are in the garden and they are eating our vegetables!"

     Mrs Brown ran out, but it was too late. All the vegetables were finished! Mrs Brown cried, and her

neighbour was very sorry, but that was the end of the vegetables.

     Then a few days before Christmas, the neighbour brought Mrs Brown a parcel. In it was a beautiful

fat duck. And on it was a piece of paper with the words, "ENJOY YOUR VEGETABLES!"

1. Mrs Brown had a _____ behind her house.

A. shed        

B. small garden        

C. an apple orchard  

D. small house

2. In _____ she planted some vegetables in the garden.

A. the summer    

B. the winter          

C. the autumn        

D. the spring

3. When _____ came, the vegetables looked very nice.

A. the summer    

B. the winter         

C. the autumn        

D. the spring

4. Early the next _____ her son ran into the kitchen and shouted.

A. morning        

B. afternoon        

C. evening        

D. night

5. One morning _____ were eating vegetables in the garden.

A. donkeys        

B. ducks            

C. pigs            

D. chickens

单项选择题