题干

厨房中的一些现象和做法都含有物理知识,下列对应正确的是(    )

A:打开醋瓶能闻到酸味——分子做无规则运动

B:用高压锅煮饭——利用降低气压,提高水的沸点

C:打开锅盖看到“白气”——汽化现象

D:用煤气灶烧开水——利用做功改变物体内能

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答案(点此获取答案解析)

A

同类题3

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。

    Animals can be extremely protective of their young. But when hard times call, animal fathers can be really a danger to their own kids.

Daddy Lion

    A combination of laziness, pride, cruelty and anger makes the lion one of the most fearsome and worst dads of the animal kingdom. When not walking proudly across the jungle, the father lion just lazes around under the sun, or waits for one of its lioness(母狮子) partners to bring back food. Once the lioness gets home the food, the lion eats up most of it, and leaves little or nothing at all for the kids. The father doesn't even train the kids for hunting and surviving, it is the lioness who teaches them how to fend for themselves.

The Polar Father

    Cute, pure and soft. Protective of young ones and family? Sure. But what makes the polar bears one of the worst dads of the animal kingdom? They don't take care of the young ones, they won't take up the responsibility of feeding them, they won't take care of them like a father should. They just leave that to the mother bear.

The Assassin Bug(猎蝽)

    Size matters, you say? This little bug would eat its own eggs to stay strong and fulfill its hunger needs. The male assassin bug is actually responsible for guarding the eggs. The female assassin bug lays eggs in large numbers. The male bug eats the weaker eggs.

Daddy Bass(岩鲈鱼)

Usually, water calms you down. Not so much for this underwater species. The male bass is known to eat up eggs from its own spawn. It guards the spawn(子,卵) laid by its female partner. However, when hungry and unable to hunt for food, the father won't think twice before eating up the eggs.

    And do you think your father was strict and hard? After reading this article, I'm sure you think your dad is the best in the whole wide world for not eating you up!

同类题4

阅读下文,回答相关问题
                                                                                             心田上的百合花
        在一个偏僻遥远的山谷里,有一个高达数千尺的断崖。不知道什么时候,断崖边上长出了一株小小的百合。百合刚刚诞生的时候,长得和杂草一模一样。但是,它心里知道自己并不是一株野草。它的内心深处,有一个内在的纯洁的念头:“我是一株百合,不是一株野草。惟一能证明我是百合的方法,就是开出美丽的花朵。”有了这个念头,百合努力地吸收水分和阳光,深深地扎根,直立地挺着胸膛。终于在一个春天的清晨,百合的顶部结出了第一个花苞。
        百合心里很高兴,附近的杂草却很不屑,它们在私底下嘲笑着百合:“这家伙明明是一株草,偏偏说自己是一株花,还真以为自己是一株花,我看它顶上结的不是花苞,而是头脑长瘤了。”公开场合,它们则讥讽百合:“你不要做梦了,即使你真的会开花,在这荒郊野外,你的价值还不是跟我们一样?”     百合说:“我要开花,是因为我知道自己有美丽的花;我要开花,是为了完成作为一株花的庄严生命;我要开花,是由于自己喜欢以花来证明自己的存在。不管有没有人欣赏,不管你们怎么看我,我都要开花!
        在野草的鄙夷下,野百合努力地释放内心的能量。有一天,它终于开花了。它那灵性的洁白和秀挺的风姿,成为断崖上最美丽的颜色。这时候,野草再也不敢嘲笑它了。
        百合花一朵一朵地盛开着,花朵上每天都有晶莹的水珠,野草们以为那是昨夜的露水,只有百合自己知道,那是极深沉的欢喜所结的泪滴。年年春天,野百合努力地开花、结籽。它的种子随着风,落在山谷、草原和悬崖边上,到处都开满洁白的野百合。  
        几十年后,远在百里外的人,从城市,从乡村,千里迢迢赶来欣赏百合开花。许多孩童跪下来,闻嗅百合花的芬芳;许多情侣互相拥抱,许下了“百年好合”的誓言;无数的人看到这从未见过的美,感动得落泪,触动内心那纯净温柔的一角。
        不管别人怎么欣赏,满山的百合花都谨记着第一株百合的教导:“我们要全心全意默默地开花,以花来证明自己的存在。”