题干

谜语“大禹建国”,打二十四节气中的名称之一,谜底应是(    )

A:春分

B:立夏

C:谷雨

D:冬至

上一题 下一题 0.0难度 选择题 更新时间:2012-12-11 09:04:55

答案(点此获取答案解析)

B

同类题2

阅读课内语段,回答后面问题。

    ①人们常常把人与自然对立起来,宣称要征服自然。殊不知在大自然面前,人类永远只是一个天真幼稚的孩童,只是大自然机体上普通的一部分,正像一株小草只是她的普通一部分一样。如果说自然的智慧是大海,那么,人类的智慧就只是大海中的一个小水滴,虽然这个水滴也能映照大海,但毕竟不是大海,可是,人们竟然甲地宣称要用这滴水来代替大海。

    ②看着人类这种狂妄的表现,大自然一定会窃笑——就像母亲面对无知的孩子那样的笑。人类的作品飞上了太空,打开了一个个微观世界,于是人类乙,以为揭开了大自然的秘密。可是,在自然看来,人类上下翻飞的这片巨大空间,不过是咫尺之间而已,就如同鲲鹏看待斥鹅一般,只是蓬蒿之间罢了。即使从人类自身智慧发展史的角度看,人类也没有理由丙:人类的知识与其祖先相比诚然有了极大的进步,似乎有嘲笑古人的资本;可是,殊不知对于后人而言我们也是古人,一万年以后的人们也同样会嘲笑今天的我们。也许在他们看来,我们的科学观念还幼稚得很,我们的航天器在他们眼中不过是个非常简单的儿童玩具。人类的认识史仿佛是纠错的历史,一代一代地纠正着前人的错误,于是当我们打开科学史的时候,就会发现科学史也是犯错误的历史。那么             ?

    ③人类发明了种种工具,挖掘出大自然用亿万年的时间积累下来的宝藏——一煤炭、石油、天然气以及其他各种矿物,人类为自己取得这些成就而丁,然而,谁能断言那些狼藉斑斑的矿坑不会是人类自掘的陷阱呢?

     ④在宇宙中,一定存在着远比我们的智慧要高得多的生物,因为我们的太阳系只有40多亿年的历史,就演化出了有智慧的生物,而宇宙至少已有200亿年的历史了。可以推想,在那些比太阳系更古老的星系里,一定早就演化出了更高级的生物。这些生物的智慧也许是我们所无法比拟的。他们看我们,也许就像我们看蚂蚁一般,即使我们中间的那些伟大人物,在他们看来也不过尔尔。

同类题5

阅读理解

    A new phone app uses shaking from smartphones to warn people about earthquakes. The new app is called MyShake, which is the work of four researchers at the University of California. Berkeley.

    Smartphones are equipped with accelerometers(加速器). MyShake uses phone accelerometers to measure seismic (地震的) activity. It has been programmed to know the difference between normal activity and earthquake movement. The software developers say their app is right 93 percent of the time. A smartphone sends seismic information to the app developers. If the developers receive several warnings from one area, it recognizes that an earthquake may be taking place or will take place soon. Using information sent from the app, the network then judges the location and strength of the quake in real time. MyShake can record 5.0 earthquake at distances of 10 kilometers or less.

    MyShake uses very little power, according to its developers. Only when seismic activity is sensed by the app does it become active and sends data to the network. The app works best when your phone is resting on a flat surface, like a table.

    The developers hope that MyShake can add to information collected by the U.S Geological Survey. That U.S agency has created the Earthquake Early Warning System, also known as the EEW. The EEW has used sensors for measuring quakes in many areas. In places where no such equipment exists, MyShake may be the only method of early quake detection (发现). The app also shows ways to stay safer during an earthquake. The developers say it will become more effective as more people use it.

    The developers say they hope to add a feature that will warn people about possible tsunami after an earthquake.