问题 填空题

写出符合下列要求的物质的化学式:①能作为气体燃料单质的是______; ②能与CO2反应的氧化物______;③与血红蛋白结合使人中毒的气体是______;④金刚石和石墨的化学式______;⑤能形成酸雨污染空气的有毒气体的是______.

答案

①氢气由双原子构成的分子,其化学式H2

②水的化学式“氢二氧一”,故其化学式为H2O;

③一氧化碳的化学式符合“氧右非左”,故其化学式为CO;

④金刚石和石墨由碳原子直接构成,其化学式用元素符合表示:C;

⑤二氧化硫的化学式符合“氧右非左”,由读法“由右向左”,书写为SO2

故答为:①H2;②H2O;③CO;④C;⑤SO2

阅读理解与欣赏
阅读理解

I am a good mother to three children. I have tried never to let my profession stand in the way of being a good parent.

I no longer consider myself the center of the universe. I show up. I listen. I try to laugh. I am a good friend to my husband. I have tried to make marriage vows(誓约) mean what they say. I am a good friend to my friends, and they to me. Without them, there would be nothing to say to you today.

So here's what I wanted to tell you today: Get a life. A real life, not a desire of the next promotion(提升), the bigger paycheck, the larger house.

Get a life in which you are not alone. Find people you love, and who love you. And remember that love is not leisure(空闲), it is work. Pick up the phone. Send an e-mail. Write a letter. And realize that life is the best thing and that you have no business taking it for granted.

It is so easy to waste our lives, our days, our hours, our minutes. It is so easy to exist instead of to live. I learned to live many years ago. Something really, really bad happened to me, something that changed my life in ways that, if I had my choice, it would never have been changed at all. And what I learned from it is what, today, seems to be the hardest lesson of all.

I learned to love the journey, not the destination. I learned to look at all the good in the world and try to give some of it back because I believed in it, completely and totally. And I tried to do that, in part, by telling others what I had learned. By telling them this: Read in the backyard with the sun on your face. Learn to be happy. And think of life as a deadly illness, because if you do, you will live it with joy and passion as it ought to be lived.

小题1:The best title of this passage probably is________.

A.Love your friends

B.Live a real life

C.Don't waste time

D.Be a good mother and wife小题2:The underlined sentence "It is so easy to exist instead of to live" in the fifth paragraph probably has the same meaning as________.

A.it is so easy to keep alive but not to live a real life

B.it is very hard to live a real life

C.it is so easy to make a living

D.it is more difficult to exist than to live a happy life小题3:What's the author's attitude toward work?

A.Do it well to serve others.

B.To earn enough money to make life better.

C.Try your best to get higher position and pay.

D.Don't let it affect your real life.小题4:It can be inferred from the passage that_________.

A.the author is a success in personal life

B.the author didn't try her best to work well

C.the author spent all her time caring for her children

D.the author likes traveling very much