问题 选择题

三氯化氮(NCl3)是一种淡黄色的油状液体,测得其分子具有三角锥形结构。下列对NCl3的有关描述正确的是(  )

A.NCl3是三角锥形结构,故它是非极性分子

B.NCl3分子间可形成氢键,故它比PCl3难挥发

C.NCl3有孤电子对,它还能以配位键的形式再与一个Cl结合

D.NCl3分子中不存在非极性共价键

答案

答案:D

虽然NCl3具有三角锥形结构,但不关于中心对称,故它是极性分子;NCl3分子中不含氢原子,分子间只有分子间作用力,没有氢键,故它比PCl3易挥发;NCl3分子中虽然有孤电子对,但Cl没有空轨道,故不能再以配位键的形式结合Cl;NCl3分子中只有极性共价键。

阅读理解

“BANG” the door caused a reverberation.“Never set foot in this house again!” shouted Father.With tears welling (涌出) up in my eyes,I rushed out of the house and ran along the street.

A young father who held a child in his arms walked past me.I felt as if I saw my childhood from another space:happy and harmonious.

But now I don’t know whether it is because I have grown up or because Dad is getting old.We are just like two people coming from two different worlds.It feels like there is an iron door between us that can never be opened.

I wandered the street,without a destination in my mind.My heart was frozen on this hot summer night.As I walked on there were fewer and fewer people in the streets,until I had only streets to keep me company. When I finally reached the high rise apartment block in which I lived, I saw that the light was still on.

I thought to myself,“Is Father waiting for me, or is he still angry with me?”

In fact,it was nothing.Perhaps,Dad was throwing some of his old stamps.Perhaps he thought they were useless.I never had the courage to tell him that I liked collecting stamps.

All the lights were off except Father’s.

Dad was always 1ike this.Maybe he didn’t know how to express himself.After shouting at me,he never showed any mercy or regret. After an argument he will creep(蹑手蹑脚)up in my sleep and then tuck me underneath the covers.

This was how he always was.He has been a leader for so long that telling everyone else what to do has become his second nature.

The light was still on. With the key in hand,I was as nervous as I had ever been.At last,I decided to open the door.As soon as I opened the door tears ran down my cheeks.I suddenly realized that the iron door that I had imagined between us did not exist at all. Love-it is second to none.

41. The underlined word “reverberation” refers to _____________.

A.a sound forced back      B.a heavy blow      C.a shake      D. an earthquake

42. When seeing a young father with a child in his arms, the writer might have the following feelings EXCEPT _____________.        

A. He admired them very much

B. He wished that the relation between him and his father could also be so harmonious

C. He felt that happiness had been far away from him/her

D. He felt disappointed with his father

43. Why do you think the father often shouts at his child?

A.The father is getting older and older.      

B.The child had already grown up.

C.They never agree with each other.       

D.The father has got used to doing that.

44. What conclusion can you draw after reading the text?

A.The father treats his child in an unfair way.    

B.The father is actually kind to his child.

C.The father is neither kind nor cruel to his child. 

D.The father is always finding fault with his child.

45. The article is ____________.

A. expository writing                         B. argumentative writing     

C. narrative writing                            D. reportage

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