请从微观角度解释下列问题．

（1）气体比液体易于压缩____ ．

（2）钠元素与氯元素的化学性质不同____ ．

（3）金刚石很硬，而石墨却很软____ ．

《苏幕遮》的开头用碧云、____、____、____，构成一幅色彩斑斓的画面。

例句：爱国是什么？爱国是屈原的“路漫漫其修远兮，吾将上下而求索”。

先阅读短文，掌握其大意。然后从方框中所给的词中选出恰当的10个，并用其适当形式填空，每个此限用一次。

 
After almost 24 hour of traveling, I was in Beijing. I was ____  with some of my classmates. We were all tired and dirty. Even at the airport, it was ____ that we were in a foreign country which was very different ____  our own. For us, the language sounded very____ . Although nervous, I felt excited.
It’s amazing____  there are so many places of interest (名胜) in Beijing. We visited the Forbidden City, Tian’anmen Square and the Great Wall.
One day, Li Bo, a Chinese friend of ____ , took us to visit a village. On the way, it rained ____ . we were wet when we arrived, but we were happy to see the mountains in the____ . They were really beautiful. The China Study Tour made me ____  a lot about the country, the people I met and even myself. It was the most valuable (宝贵的) part of my college life. I often encourage my friends to ____  a study tour. There’s no other way to learn so much in only four weeks!

如图是小明做“估测大气压的值”的实验示意图。