问题 填空题

生活中的化学 

下面是俞觉敏同学写的作文《我的妈妈》中的一个片段:“妈妈能利用来自福安县的廉价葡萄自酿葡萄酒,这种家酿酒口感非常不错.葡萄酒酿好后不是直接装瓶,而是用纱布制成的袋子过滤后再装瓶,这样的目的是…”根据以上内容回答问题

(1)葡萄酒过滤的目的是______.

(2)俞觉敏同学决定亲自动手做一做过滤实验,体验一下过滤的作用,她用浑浊的泥水进行过滤.她配制过滤器除了滤纸、铁架台外,还需要下列哪些仪器______(填代号).

(3)过滤完后,她发现水仍很混浊其原因可能是______.

(4)过滤后的水澄清透明,因此俞觉敏认为过滤可以降低水的硬度.李明认为不对,因为降低水的硬度的方法是(写一种即可)______.

(5)北方很多城市都缺水,严重影响到人们的生产和生活.我县森林覆盖率很高,山青水秀,为我们创造了一个美好的生活环境.为了使我们的天更蓝水更清,你的做法是(任写一点)______.

答案

(1)自制的葡萄酒中常混有葡萄皮、籽等不溶性事杂质等.葡萄酒过滤的目的是除去葡萄酒中的葡萄皮、籽等不溶性事杂质;

(2)配制过滤器除了滤纸、铁架台外,还需要漏斗、烧杯、玻璃棒等;

(3)过滤完后,仍很混浊其原因可能是 滤纸破了或液面高于滤纸的边缘,不溶物直接进入滤液使滤液浑浊;

(4)降低水的硬度的常用方法是煮沸;

(5)为了使我们的天更蓝水更清,应不焚烧垃圾、合理使用化肥和农药等.

故答为:(1)葡萄酒过滤的目的是 除去葡萄酒中的葡萄皮、籽等不溶性事杂质;(2)B,C,D;(3)滤纸破了;(4)煮沸;(5)不焚烧垃圾..

阅读理解

阅读理解

                                                                Life in 2060

     Let us suppose it is now about A.D. 2060. Let's make believe (假装;虚构) it is about sixty years

from now. Of course, things have changed and life is very different.

     Voyages to the moon are being made every day. It is as easy to take a holiday on the moon today as

it was for the people in 1960 to take a holiday in Europe. At a number of scenic spots on the moon, many hotels have been built. The hotels are air-conditioned, naturally. In order that everyone can enjoy the

beautiful scenery on the moon, every room has at least one picture window. Everything imaginable is

provided for entertainment (娱乐) of young and old.

     What are people eating now? People are still eating food. They haven't yet started to take on heir (继承) supply of energy directly as electrical current or as nuclear power. They may be some day. But many

foods now come in pill form, and the food that goes into the pill continues to come mainly from green

plants.

     Since there are several times as many people in the world today as there were a hundred years ago,

most of our planet's surface has to be filled. The deserts are irrigated with water and crops are no longer

destroyed by pests. The harvest is always good.

     Farming, of course, is very highly developed. Very few people have to work on the farm. It is possible

to run the farm by just pushing a few buttons now and then.

     People are now largely vegetarians (素食者). You see, as the number of people increases, the

number of animal decreases. Therefore, the people have to be vegetarians and we are healthier both in

our bodies and in our minds, and we know the causes and cure of disease and pain, and it is possible to

get rid of diseases. No one has to be ill any more.

     Such would be our life in 2060.

1. When was the passage written?

A. In about A.D. 2060.    

B. In about 1960.

C. In about 2000.    

D. In about 2004.

2. According to the passage, what will be on the moon in about A.D. 2060?

A. Many tourists.  

B. Many other animals.

C. Many plants.  

D. A sea.

3. What will people eat then according to the passage?

A. Biscuits in pill form.  

B. Foods in pill form.

C. Foods in water form.  

D. Foods in gas form.

4. The passage tells us that in 2060, ____ on the earth than now.

A. there are fewer population              

B. there are more pests

C. there is less water                      

D. the crops are getting better

单项选择题