根据短文理解, 选择正确答案。
"Haibao, the mascot(吉祥物) of the 2010 Shanghai World Expo, is very cute, "said Gu Hui, a school kid. "I want a big toy like the mascot."
Haibao looks like the Chinese word ren, which means people or a person. The name, a typical lucky one in Chinese tradition comes from the Chinese phrase "Si Hai Zhi Bao" —the treasure of the four seas. It also means the treasure of Shanghai, which lies beside the sea.
Haibao's blue curly(卷曲的) hair looks like the waves of the sea. Its smile is a sign of the healthy spirit of China. Those thumbs-up(翘拇指) will welcome millions of people to Shanghai from around the world. Its big feet show China has the ability to host a successful Expo.
Haibao was created by two artists, one from the mainland(大陆) and the other from Taiwan. The design is about people living together in the city. The designers want it to fit the theme of the Shanghai Expo, that is, a good life should be created by all the people and people should have harmonious relationships(和谐关系) with nature and society, so that life in cities would be better.
Surely the mascot will become the lucky symbol and cultural remark of Shanghai Expo.
两容器内的气体可能具有：（1）相同的原子数（2）相同的密度（3）相同的质量（4）相同的分子数；上述说法正确的是（ ）
