题干

一辆汽车从斜坡上匀速下滑的过程中,下列说法正确的是()

A:动能不变,重力势能减小

B:动能不变,重力势能不变

C:动能增加,重力势能减小

D:动能减小,重力势能减小

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答案(点此获取答案解析)

A

同类题2

The values of artistic works, according to cultural relativism(相对主义), are simply reflections of local social and economic conditions. Such a view, however, fails to explain the ability of some works of art to excite the human mind across cultures and through centuries.

              History has witnessed the endless productions of Shakespearean plays in every major language of the world. It is never rare to find that Mozart packs Japanese concert halls, as Japanese painter Hiroshige does Paris galleries, Unique works of this kind are different from today’s popular art, even if they began as works of popular art. They have set themselves apart in their timeless appeal and will probably be enjoyed for centuries into the future.

               In a 1757 essay, the philosopher David Hume argued that because“the general principles of taste are uniform(不变的) in human nature,”the value of some works of art might be essentially permanent. He observed that Homer was still admired after two thousand years. Works of this type, he believed, spoke to deep and unvarying features of human nature and could continue to exist over centuries.

               Now researchers are applying scientific methods to the study of the universality of art. For example, evolutionary psychology is being used by literary scholars to explain the long-lasting themes and plot devices in fiction. The structures of musical pieces are now open to experimental analysis as never before. Research findings seem to indicate that the creation by a great artist is as permanent an achievement as the discovery by a great scientist.

同类题3

阅读短文,回答问题。

我喜欢我

    当你看到这个题目时会说:“嘿!新鲜事,哪有自己喜欢自己的?”哎,老实说,人人都爱自己,哪个会讨厌自己呢?

    我喜欢我,是有足够的理由的。老师器重我,不论什么比赛都首先想到我,点我的名。那次数学尖子班招生,老师便问我:“李峰,这个班你要参加吗?”最近要搞绿化知识竞赛,老师又严肃地对我说:“这次让你参加,希望你和同学一起努力,争取拿到第一。”我笑嘻嘻地答应了。老师摸摸我的头,满意地笑了。

    老师喜欢我,同学们也喜欢我。尽管我的字,被誉为“李体”,因为我的字太差了;我的话,被誉为“李腔”,因为我说话有点结巴,但同学们听过我写的好文章后,都用佩服的眼光看着我,李华竟夸我:“浑身都是宝。”嘿!我不成了“穿山甲”了。上次参加完绿化知识竞赛,我被刷了下来,很伤心,哭了。同学们七嘴八舌地安慰我:“不要哭了,反正还有机会。”“别伤心了,男儿有泪不轻弹。”我望了望同学们,心想,我不能让爱我的同学们也伤心,于是,止住了哭。

    我也确实喜欢自己。咱犯了错,能马上改正;说不清楚,可文笔好。我想:“天生我材必有用。”只有爱自己的人,才会充满信心,以自己的努力,不让别人失望,对得起他们的爱。你们说,是不是这个道理?