根据短文理解，从A、B、C、D四个选项中选择最佳一项填空。

    What is your greatest dream? We received several different answers to the question.

    Zhu Weiqi: I remember the sky was really 1 when I was a child. But now there are more and more 2, and we have begun to lose that sky which looked like a blue diamond(宝石).

    Wu Qihang: It is great to see the fast 3 of science, but I would rather see the development of people in China.

    Su Yang: Now, some areas are still not peaceful in the world. Many people are 4 and thousands of children cannot go to school. I hope that in the near future, people in there can live a(n) 5 life.

    Li Ziliang: I wish that one day I could have my own spaceship. I hope I could 6 a new planet that is suitable for us to live on so that the Earth will not be 7 any more. We can live a happy life both on the new planet and on the Earth.

    Chen Xiaoxin: My dream is to travel 8 the world and collect smiling faces, and then 9 them into space. A smile would build up a(n) 10 between us and the aliens.

下列各过程中所散失的水分中主要属于结合水的是（   ）

阅读材料，回答问题。

材料一：明代长城东起鸭绿江边，西至甘肃省嘉峪关，全长6 000多千米，是中国古代最宏伟的军事防御工程。万里长城被视为中华民族的象征和骄傲。

材料二：相传2 000多年前，秦始皇修长城时，强征天下民夫。孟姜女的丈夫也被抓去，累死在长城脚下。孟姜女千里寻夫送寒衣，得到的却是丈夫的死讯，她悲恸欲绝，竟哭倒了长城。

材料三：见下图。