Years ago, I lived in a building in a large city. The building next door was only a few feet away from mine. There was a woman who lived there, whom I had never met, yet I could often see her sit by her window, sewing or reading.

    After several months, I began to notice that her window was dirty. Everything was unclear through the dirty window. I would say to myself, “I wonder why that woman doesn't clean her window. It really looks terrible.”

    One bright morning I decided to clean my flat, including the windows.

    Late in the afternoon when I finished the cleaning, I sat down by the window with a cup of coffee for a rest. What a surprise! The woman sitting by her window was clearly visible. Her window was clean!

    Then it dawned on me. I had been criticizing (批评) her dirty window, but all the time I was watching hers through my own dirty window.

    That was quite an important lesson for me. How often had I looked at and criticized others through the dirty window of my heart, through my own shortcomings?

    Since then, whenever I wanted to judge (评判) someone, I asked myself first, “Am I looking at him through my own dirty window?”

    Then I try to clean the window of my own world so that I may see the world about me more clearly.

    What will man be like in the future — in 5,000 or even 50,000 years from now? We can only make a guess, of course, but we can be sure that he will be different from what he is today. For man is slowly changing all the time.

Let us take an example. Man, even five hundred years ago, was shorter than he is today. Now, on the average, men are about three inches taller. Five hundred years is a relatively (相对地) short period of time, so we may suppose that man will continue to grow taller.

    Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain's capacity (容量.) As time goes on, however, we shall have to use our brains more and more and finally we shall need larger ones! This is likely to bring about a physical change too. The head, especially the forehead, will grow larger.

    Nowadays our eyes are being used too much. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over a very long period of time it is likely that man's eyes will grow stronger.                      

    On the other hand, we tend (有…的趋势) to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive (敏感的) because they are used a great deal in modern life.

    What about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both men and women are probably to be hairless!

    Perhaps, all this gives the impression that future man will not be a very attractive (有吸引力的) person to look at! This may well be true. All the same, besides these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and feelings similar to our own.

阅读下列短文，从下面每题的A、B、C、D四个选项中选出最佳答案。

    Model United Nations (MUN模拟联合国) offers a fantastic program to the youth worldwide. In Model UN, student delegates (代表) step into the shoes of ambassadors (大使) from UN members to debate the latest problems. Any student can take part in Model UN, as long as they have the dream to learn something new and to work with people to try and make a difference in the world. 

    In March, the 2017 MUN Youth Summit（峰会）was held in the Golden Hall of the United Nations Headquarters (总部), New York. Over 2000 student delegates from 67 countries came together to listen, present, debate, and offer solutions to some of our planet's most serious problems.

    Zhou Kexin, from Futian Foreign Language School, as one of the 13 delegates from Shenzhen, attended this international conference (会议). During the four days' meeting, she played the role of a Bolivian (玻利维亚) delegate. She made speeches and debated how to improve and protect women's and children's rights. She exchanged ideas with student delegates from other countries. They worked hard to find solutions to the world's development and human rights problems.

    Zhou Kexin survived three rounds of Model UN competitions including an English language test, a prepared speech, and a group discussion before she reached the final. It was her excellent English, critical (批判的) thinking and communicative skills that made her stand out from the other 1,600 Shenzhen contestants. In the final held on January 15th, Kexin managed to become one of the top prize winners. This meant she got a free ticket to a ten-day trip to the UN Headquarters in New York and finally became a teenage diplomat.