Imagine one day the water taps (水龙头) in your house stop running. You have to pay a lot of money to buy water from shops. And still there isn't enough water for everyone. Your mother has to save the family's shower water to use for washing clothes. Would you be able to stand that kind of life?
   Probably not. But that is what kids in Yemen (也门) are experiencing (经历). According to a report, the capital, Sana, will run out of drinking water as early as 2025.
   Because of the water shortage (短缺), the Yemen government often cuts the water supply (供应). Hannan, an 18-year-girl, tells the Teens, “In a good week we'll have a water supply all week. But then the next week there will be water only for a day or two.”
   Hannan says only rich people have enough water to use. They can buy water from the shops or from the water trucks. Private (私人的) companies own the trucks, They travel around the city every day to sell water-- at very high prices.
   “A lot of people can't pay for it,” she says.
   The government is thinking of making use of seawater. But it will cost a lot and it may not happen soon enough to help the people of Yemen.

当代学者顾准说:“城邦制度和直接民主两者是相互依存、互为条件的。”雅典城邦为直接民主提供的条件是（   ）

下列函数在其定义域上，既是奇函数又是减函数的是（     ）

从美学上讲，崇高美表现于外在方面，                                         。

①德国哲学家康德把崇高分为两类：数学的崇高，如高山的体积；力学的崇高，如暴风雨的气势。

②《沁园春·长沙》就是其中优秀的作品之一。

③我国的孔子也把“大”与崇高联系起来，赞叹：“大哉！尧之为君也。巍巍乎，唯天为大，惟尧则之。”

④体现为高大、辽阔、巍峨、宏伟等壮丽景象。

⑤俄国著名文艺批评家车尔尼雪夫斯基也说：“一件事物较之与它相比的一切事物要巨大得多，那便是崇高。”

⑥这种巍峨、博大、壮阔的崇高美，在毛主席诗词中，以对山川景物的描绘体现得最为鲜明。