问题 填空题

根据信息写出化学方程式:

(1)打火机中的燃料C4H10完全燃烧:_________________。

(2)手机. 笔记本电脑等电子产品中使用的锂电池具有体积小. 放电时间长等优点,其放电时的工作原理是锂(Li)与二氧化锰作用生成LiMnO2:___________________ 。

(3)海洋中资源丰富,如碘(I2)的获得可将海藻. 海带经处理后所得的NaI溶液与Cl2发生置换反应而得到。该反应的化学方程式为:_____________________ 。

(4)一些豆科植物能将空气中的氮气转化为能被作物吸收的氮的化合物,其反应可看作是氮气. 碳. 水在根瘤菌的催化作用下生成了氨(NH3)和二氧化碳: __________________。

(5)在400℃左右,有催化剂的条件下,用氨气可将有毒气体NO还原为水和氮气。该反应的化学方程式为: ___________________。

答案

(1) 2C4H10 +13O2 8CO2+10H2O

(2)Li +MnO2 LiMnO2

(3)Cl2 + 2NaI =I2+2NaCl

(4) N2+3C+3H2O 2NH3 + 3CO2 

(5) 4NH3+6NO6H2O+5N2

单项选择题
完形填空

It was near Christmas during my first semester teaching at a new school. I loved my small special class more than any group I had taught in the past. They were hungry for knowledge and I was enjoying teaching.

Other teachers had told me that our children were from poor families and not to expect any child to bring a Christmas gift. In fact,I wasn't expecting any gifts.

Imagine my surprise when every child brought me a gift on the day before our holiday break. First,I got a much ­loved stuffed monkey from a shy girl. I was told,“He is my favorite,but I love you and I want him to be with you,Miss Taylor.”How thrilled I was!

Next came a new set of Christmas tree lights that was “missing” from a mother's cupboard.

Finally,I came to one little boy's gift which I had never received. It was an old,dirty and broken Christmas story book. Just when I wanted to express my happiness,I was interrupted(打断)by the giver,“And see,it is new!It still has the price tag.”

When other children laughed at him,I stopped them and said,“Oh,books are good in that way. The story is always new if you have not read it before. Now,let's share one together.”Everyone listened quietly as I read the most wonderful Christmas story of my life.

I still keep those Christmas gifts. They always remind me of my lovely kids.

小题1:Why did the teacher like her small special class?

____________________________________________________

小题2:When did the children bring their teacher gifts?

__________________________________________________________

小题3:Who sent a stuffed monkey to the teacher?

_______________________________________________________

小题4:Was the Christmas story book new?

________________________________________________________

小题5:How did the teacher feel when she got the gifts?

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