题干

1859年,达尔文发表了科学巨著《物神起源》。他在科学理论方面的贡献是(  )

A:发现了杠杆定定律和浮力定律

B:建立了完整的力学理论体系

C:揭示了生物界自然选择规律

D:为原子能应用提供理论基础

上一题 下一题 0.0难度 选择题 更新时间:2019-12-19 03:05:15

答案(点此获取答案解析)

C

同类题4

Good evening, ladies and gentlemen. Welcome to the nine o’clock Mystery Hour. Today we’ll show you two British stories. We hope you’ll enjoy them.
About 900 years ago two green children arrived in a small village in south England. Their eyes and skin were green and they spoke a strange language. They were very tired and weak, so the people of the village looked after them. The boy died a year later, but the girl grew strong and lived the rest of her life there. And her skin colour turned back to normal day by day. Scientists say that sometimes of people don’t have enough food to eat for a long time, their skin goes very pale and can even turn green.
Loch Ness is the largest lake in Scotland. It’s a very deep and cold lake. For hundreds of years, people have talked about a monster(怪物) called Nessie which lives in the lake. About seventy years ago, two people saw something moving in the lake. They said that the animal was playing and rolling around in the water. Since then many people say they have seen the monster. Their descriptions are always the same. It looks like a dinosaur, with a very long neck and a small head. It has a big bump(包,肿块)on its back. People have tried to photograph the animal, but the pictures have not been very clear. Scientists don’t know whether there is a monster or not. Some say it may be a whale or a very large fish. Some think it’s a snake. Others say there’s nothing at all— nothing but people’s imagination. Maybe we’ll never know what’s in Loch Ness.


同类题5

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那个春天,很暖

    ①女儿一岁时,婆婆得了精神疾病,生活基本上能够自理,自己每天买菜做饭洗衣服,只是一到傍晚,就会出现幻觉,常常会无缘无故地把家里的东西扔掉。记得有一次女儿感冒,婆婆竟然把感冒药全部扔到了池塘里,还振振有词说那些都是毒药。说着说着,婆婆害怕地哭了。女儿在一边也哭个不停。我看着两个泪人,也忍不住哭了。

    ②那个冬天,很冷……

    ③女儿五岁那年,有一天她怯怯地对我说:“妈妈,我可不可以换掉我奶奶呀?我要让惜愉的奶奶做我的奶奶!”我说为什么呀,她说:“我的奶奶一点都不好!从来没有疼爱过我!但是惜愉的奶奶对惜愉可好了,每天来幼儿园接惜愉回家,回到家还给他做好多好吃的,冬天灌好热水袋给惜愉捂手,夏天拿着扇子不停地给惜愉赶蚊子。”我把女儿搂在怀里:“这世上每一个做奶奶的都会疼爱自己的孙女。奶奶之所以没有好好疼爱你照顾你,那是因为她病了。从你出生的那天起,她注定是你一辈子的奶奶,这个谁也无法代替的。”女儿失望地低下了头。

    ④女儿七岁时,上小学一年级。有一天,她回家狠狠地把书包扔在桌上,愤愤地说:“我有这么个奶奶真是倒霉死了!害得我天天被同学们嘲笑,抬不起头来!”我问怎么了?她说:“奶奶每天去菜市场买菜,都经过我们学校。你说她可笑不可笑,冬天扇扇子,夏天戴个绒线帽,同学们都说她是疯婆子!”我气得把女儿的书包扔在地上,(1)恶狠狠地说:“别人可以看不起你奶奶,可以嘲笑她,歧视她,但是你不可以!因为你是她最亲的人,你的身上流着她的血!你要想同学们尊重你奶奶,首先要做到自己尊重你奶奶!不管奶奶变成什么样子,她永远是你要去敬重的人!”女儿第一次看到我如此情绪激动,不停地说:“妈妈,我错了。”

    ⑤女儿九岁那年,有一天我送她去学校。远远地看见在学校门口有三个小男孩子正将香蕉皮扔向婆婆,我刚想制止,却见(2)女儿用力挣脱我的手,飞一般地跑过去,用小小的身体护着她奶奶,大声地喊着:“不许你们欺负我奶奶!”三个男孩愣住了,呆立在那里。我走过去,轻声对他们说:“我不跟你们讲大道理。每个人都会有老的一天,每个人也都会有生病的时候,想想看是不是?”三个男孩愣了一会儿,默默地走到我女儿面前说:“我们再也不欺负你奶奶了。”

    ⑥女儿十一岁那年,院子里开满了鲜花。她让奶奶手持一根木棍,木棍的一头系着一根漂亮的红丝线,红丝线在风中轻盈地飘着。女儿说她在和奶奶钓蝴蝶。我问,没有钩怎么能钓得着蝴蝶呢?女儿说,她和奶奶不是在钓蝴蝶的身子,而是在钓蝴蝶的快乐!看着她们祖孙俩灿烂的笑容,我也笑了。

    ⑦那个春天,很暖……