问题 填空题

用H、O、C、Fe、Ca四种元素组成符合下列要求的物质的化学式:

(1)可作火箭高能燃料的单质是______;

(2)制造刀具的高碳钢的主要成分______;

(3)可用于人工降雨的一种氧化物______;

(4)配制波尔多液的一种碱______.

答案

(1)可作火箭高能燃料的是具有可燃性的物质,由以上元素可知氢气、氧气、碳都可做燃料,氧气是助燃性气体,不能做燃料,碳虽然可作燃料,但放热少,可作火箭高能燃料的单质是氢气,化学式是H2

(2)制造刀具的高碳钢属于钢,属于铁的合金,主要成分是铁,含的杂质主要是碳含量少,铁属于金属直接用元素符号表示,故化学式是Fe;

(3)固态二氧化碳是干冰,易升华,吸收热量,使周围温度降低,空气中水蒸气冷凝成水滴,所以可用于人工降雨的一种氧化物是二氧化碳;

(4)配制波尔多液的成分是氢氧化钙和硫酸铜,因为是碱所以是氢氧化钙,由于钙显+2价,氢氧根显-1价所以化学式是Ca(OH)2

故答案为:(1)H2;(2)Fe;(3)CO2;(4)Ca(OH)2

选择题
阅读理解

Is there a magic cutoff period when offspring become accountable for their own actions? Is there a wonderful moment when parents can become spectators (旁观者) in the lives of their children and shrug, "It' s their life," and feel nothing?

When I was in my twenties, I stood in a hospital corridor waiting for doctors to put a few stitches in my son' s head. I was asked, "When do you stop worrying?" A nurse said, "When they get out of the accident stage." My mother just smiled faintly and said nothing.

When I was in my thirties, I sat on a little chair in a classroom and heard how one of my children talked incessantly, disrupted (打断) the class, and was headed for a career making license plates. As if to read my mind, a teacher said, "Don't worry. They all go through this stage, and then you can sit back, relax, and enjoy them." My mother listened and said nothing.

When I was in my forties, I spent a lifetime waiting for the phone to ring and the cars to come home, the front door to open.

My friends said that when my kids got married I could stop worrying and lead my own life. I wanted to believe that, but I was haunted by my mother' s wan ( 淡淡的 ) smile and her occasional words, "You look pale. Are you all right? Call me the minute you get home."

Can it be that parents are sentenced to a lifetime of worry? Is concern for one another handed down like a torch to blaze the trail of human frailties and the fears of the unknown? Is concern a curse? Or is it a virtue that elevates us to the highest form of life?

One of my children became quite irritable recently, saying to me, "Where were you? I' ve been calling for three days, and no one answered. I was worried! ! !"

I smiled a wan smile.

1.What can we know about the author’s mother from the passage?

A. She seems to laugh at the author.        

B. She is not concerned about the author.

C. She has a thorough understanding of the author.     

D. She tries to give the author some encouragement.

2.What did the author do in her forties?

A. She was less concerned about her children.          

B. She couldn't stop worrying about her children.

C. She would like her children to see her often.        

D. She became more patient with her children.

3.Why did the author smile a wan smile at the end of the passage?

A. She wanted to learn from her mother.                

B. She stopped worrying about her children at last.

C. She succeeded in tricking her children.              

D. She got a kind of satisfaction from her child's concern.

4.The main purpose of the passage is to tell us that ______.

A. the concern between parents and children is natural

B. parents’ love for their children is selfless

C. parents show more concern for their children        

D. parents will worry about their children all their lives