阅读下列材料，回答问题：

材料一：“忆昔开元全盛日，小邑犹藏万家室。稻米流脂粟米白，公私仓廪俱丰实。 九州道路无豺狼，远行不劳吉日出。”

材料二：两宋时期，在气候温和、资源丰富的南方，形成了闻名天下的“粮仓”，宋代手工业取得了巨大进步，商业繁荣出现了世界上最早的商标。

    "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.

对流层大气的直接热源是(    　)

古代雅典法律规定：如果公民试图自杀，必须事先提出申请，以获得批准；未经允许的自杀被视为犯罪行为。这反映出在古代雅典(    )