问题 选择题
现有五种不同的颜色要对如图中的四个部分进行着色,要求有公共边的两块不能用同一种颜色,则不同的着色方法有(  )
A.180种B.240种C.225种D.120种
答案

根据题意,对于区域Ⅰ,有5种颜色可选,即有5种情况,

对于区域Ⅱ,与区域Ⅰ相邻,有4种颜色可选,即有4种情况,

对于区域Ⅲ,与区域Ⅰ、Ⅱ相邻,有3种颜色可选,即有3种情况,

对于区域Ⅳ,与区域Ⅱ、Ⅲ相邻,有3种颜色可选,即有3种情况,

则不同的着色方案有5×4×3×3=180种;

故选..

阅读理解

When I was a kid, my dad worked in a shop in the center of our town. Sometimes, I went to the shop with him and I made a little pocket money by buying things for his workmates. But I never paid attention to all the things and people around me.

One day, as my dad and I were driving to the shop, I looked out of the window of the car and I saw an old man standing at the street corner. There was a rose in his hand, he was smelling the rose. For some reason, our eyes met and we looked at each other for about twenty seconds. There was nothing unusual about this man but the meet was unusual to me. Up to that moment in my life, I had given no thought to anyone on the street, in shops or anywhere else. I had no interest out of my family.

But I was interested in that old man. For the first time I had interest in a stranger. What kind of life had he lived? Where had he been in his time?

Once a great man encouraged us to “stop and smell the rose”. Now I want to tell these words to you. Stop what you are busy with and try to fully understand things and people in your eyesight. If you don’t care about others on your road of life, then you are missing your life itself.

小题1:How did the writer make a little pocket money?

A.By asking his father to give him.

B.By stealing other’s money.

C.By buying things for his father’s workmates.

D.By asking in the street.小题2:What was the old man doing when I saw him?

A.He was selling roses.

B.He was walking in the street.

C.He was talking to the writer.

D.He was smelling a rose.小题3:When did the writer have interest out of his family?

A.When he was a kid.

B.When he met the old man with rose.

C.When he went to school.

D.When he went to work.小题4:What is the main idea of this passage?

A.If you care about others on your road of life, then you are having your life itself.

B.If you care about others on your road of life, then you are missing your life itself.

C.If you meet an old man with a rose in the street, then you’ll have interest in your life.

D.If you have interest in others, then you are having your life itself.

问答题 简答题