问题 填空题

钢铁工业已成为我国重要的支柱产业。某大型铁矿附近有炼焦煤、石灰石、黏土矿和丰富的水资源。

(1)随着铁矿的开发,该地建立了如图所示位置关系的炼焦厂、钢铁厂、发电厂和水泥厂。请写出图中B、D所代表的两个工厂的名称:B.__________;D.__________。

(2)硫铁矿其外观如黄金,故又被称为“愚人金”。现有黄金、愚人金两种小块试样,提供的仪器主要有:

A.托盘天平            B.酒精喷灯

C.试管夹              D.坩埚钳

E.烧杯                F.量筒

另外,H2O、空气可任意选用,请回答问题:

若用物理方法来鉴别该黄金、愚人金试样,应选用的仪器为__________(填代号);

②若用化学方法来鉴别该黄金、愚人金试样,应选用的仪器为__________(填代号)。

(3)煤炭燃烧排放的烟囱气中含有NOx和SO2。含有碱的黄磷乳浊液能够同时去除NOx和SO2,这是由美国科学家研发的,命名为PhoSNOx法。在该方法的最后阶段NO2与HSO3反应生成(NH4)2SO4,其离子方程式为________________________。

答案

(1)炼焦厂 水泥厂 (2)①AF ②BD

(3)NO2+3HSO3+H2O=NH4+3SO42+H

(1)用到煤的是炼焦厂和发电厂,而钢铁厂则需要焦炭,故B、C分别为炼焦厂、钢铁厂,由此推知A为发电厂,D为水泥厂。(2)物理方法是利用了两种物质的密度不同进行鉴别的。方法是用托盘天平、量筒粗略地测量黄金、愚人金的密度,其中用托盘天平粗略测量其质量,用量筒粗略测量其体积(注水法);“真金不怕火炼”,所以用灼烧法可以鉴别黄金、愚人金,愚人金灼烧有刺激性气味的气体产生,而黄金灼烧时则没有这种现象,选择的仪器是酒精喷灯和坩埚钳。(3)由得失电子守恒,可写出离子方程式。

阅读理解

阅读理解。

     The brain is the boss of the body. Your eyes, ears, nose, and skin tell your brain what is going on

around you. Other parts of your body tell your brain what is going on inside of you. Your brain takes in

the signals. It tells your body what to do with them. When you touch fire, your skin tells your brain that your

finger is too hot. Your brain tells you to move your finger. All these happen very fast. Your brain also

controls your breathing,blinking (眨眼), and heart beat. It controls your feelings and thoughts too.   

     Human shave the most developed brain of all animals. Yet it is not the largest brain. The human brain

weighs three pounds. The brain of an elephant weighs 11 pounds. So the largest brain is not always the best

brain. In people, a larger brain does not mean a clever person.

1. What is the main idea of this story?   

A. The human brain works very fast.   

B. The largest brain is not always the best brain.   

C. The brain controls the body.   

D. The best brain is the largest brain.

2. What happens after the brain takes in the signals from the body?   

A. The brain grows faster and larger.   

B. The brain tells the body what to do.   

C. The body becomes more developed.   

D. We don't know.

3. What does"the boss of the body" mean?   

A. The signals.   

B. The most developed body part.  

C. The main part of the body.   

D. The centre I centre of the body.

4. Which brain is the most developed?   

A. The largest brain.         

B. The human brain.   

C. The smaller brain.          

D. Not too big brain.

5. What are the things that the human brain does?   

A. Takes in signals.          

B. Controls breathing.   

C. Controls feelings and thoughts.   

D. A, B and C.

选择题