问题 填空题

(6分)化学就在我们身边,它与我们的生产、生活息息相关。从石灰石、金刚石、氢氧化钠、干冰、小苏打、生石灰等六种物质中,选择与下列用途相对应的物质,填写在空白处。

⑴用做建筑材料的是________________。⑵发酵主要成分之一的是______________。

⑶用作人工降雨的是_________________。⑷镶在玻璃刀头上用来裁玻璃的是__________。

⑸广泛应用于肥皂、石油、造纸等工业的是__________________。

⑹为了防止某些食品受潮,在其包装袋中放入一小袋干燥剂,这种干燥剂是       

答案

(1)石灰石 (2)小苏打(3)干冰  (4)金刚石

(5)氢氧化钠  (6)生石灰

根据物质的性质进行分析,石灰石很坚硬,可做建筑材料;金刚石是最硬的物质,常用做钻头;氢氧化钠用途广泛,可制作肥皂、造纸等、小苏打能与酸反应生成二氧化碳,常用于食品工业, 干冰升华吸热,用作人工降雨, 生石灰易与水反应生成氢氧化钙,所以生石灰具有吸水性,可以做干燥剂

阅读理解

阅读理解。

     Some people have unforgettable past memories that make them sad and angry. Well, to deal with this,

I suggest that you pick yourself up and move ahead. It is easier said than done! So here are a few ways

to bring about the change.

     Do something you really love doing. We all have interest in what we love working on, but most of us

don't have any time to do anything about them. Well, this is your time to do that! It'll take your mind away

from whatever is making you unhappy and of course it'll help you remember your happy days in the past

when you used to relax more often.

     Think long and hard. I'm sure you must be doing this already, but I want you to think about the effect

that forgiving other people could have. Think about whether you are ready to accept the changes this might

bring. Write about your feelings. Most people are too lazy to write, but it is often the best way to clear your

mind.

     Write about your experiences and then forget about your past memories. On the Internet there are

thousands of places where you can list out all your experiences without writing down your real name.

     Make a start on this and I'm sure the frequency of your worries will decrease soon enough.

1. The passage is mainly about _____. [ ]

A. how to forget bad past memories

B. how to do the things we love

C. learning to accept changes

D. writing about past memories

2. According to the passage, the best way to forget past memories is to _____. [ ]

A. write about your feelings and experiences

B. pick yourself up and move ahead

C. write letters to the author

D. forgive lazy people

3. The author thinks we can't do the things we love because _____. [ ]

A. it will take our minds away

B. we don't have any time

C. it will recollect our memories

D. it is easier said than done

4. What is not true according to the passage? [ ]

A. Forgiving other people could help you pick yourself up.

B. It's easier said than done when you try to lessen your sadness.

C. You can write your feelings on the internet without your real name.

D. Writing your feelings out is to make you remember your sad past.

单项选择题