题干

下列粒子的结构示意图中,表示具有稳定结构的原子的是(    )

A:

B:

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2016-05-25 06:33:41

答案(点此获取答案解析)

C

同类题2

根据短文理解,选择正确答案。

Marco Polo

    Marco Polo was born in Italy in 1254. A traveller and businessman, he was one of the first Europeans to travel across Asia and into China. His journey lasted 24 years.

    He set out, aged 17, with his father Nicolo and his uncle Maffeo on their great journey to China. They sailed south from Venice, Italy and stopped off in the Middle East. They ofen carried on overland to Persia (now Iran), through the Pamir Mountains and the Gobi Desert before they got to Beijing, China.At that time, China was more advanced than Europe. They already had paper, so large numbers of books were available. They also used paper money in many parts of the country.

    After he got back to Italy, Marco Polo talked about his experiences in China, and he wrote a book describing the riches of Asia. His book was the first western record of porcelain(瓷器), coal, gunpowder, printing and silk.Unfortunately, not many people believed Polo's stories and he became known as “the man of a million lies”. He died in 1324.

Jacques Cousteau

    Jacques Cousteau was a French undersea explorer, environmentalist and inventor. He was born in France in 1910. When he was young, he was attracted by the sea, machines and filmmaking. In the French navy, Cousteau began exploring underwater and worked on a special breathing machine which allowed divers to stay underwater for several hours. This gave them time to really look around under the ocean. In 1948, Cousteau began travelling the world's oceans in his research ship Calypso.Cousteau produced many films and books about his underwater experiences, including the TV series The Underwater World of Jacques Cousteau, which introduced the public to the world of sharks, whales, dolphins and treasure.

    Cousteau started the Cousteau Society to protect ocean life. In 1989, he received a great honour: he was made a member of the French Academy. Finally, after a long and varied life, Cousteau died on 25th June, 1997.

同类题3

阅读《五猖会》片段,回答问题。

    ①因为东关离城远,大清早大家就起来。昨夜预定好的三道明瓦窗的大船,已经泊在河埠头,船椅,饭菜,茶炊,点心盒子,都在陆续搬下去了。我笑着跳着,催他们要搬得快。忽然,工人的脸色很谨肃了,我知道有些蹊跷,四面一看,父亲就站在我背后。

    ②“去拿你的书来。”他慢慢地说。

    ③这所谓“书”,是指我开蒙时候所读的《鉴略》,因为我再没有第二本了。我们那里上学的岁数是多拣单数的,所以这使我记住我其时是七岁。

    ④我忐忑着,拿了书来了。他使我同坐在堂中央的桌子前,教我一句一句地读下去。我担着心,一句一句地读下去。

    ⑤两句一行,大约读了二三十行罢,他说:

    ⑥“给我读熟。背不出,就不准去看赛会。”

    ⑦他说完,便站起来,走进房里去了。

    ⑧我似乎从头上浇了一盆冷水。但是,有什么法子呢?自然是读着,读着,强记着,——而且要背出来。

粤自盘古,生于太荒,首出御世,肇开混茫。

    ⑨就是这样的书,我现在只记得前四句,别的都忘却了,那时所强记的二三十行,自然也一齐忘却在里面了。记得那时听人说,读《鉴略》比读《千字文》,《百家姓》有用得多,因为可以知道从古到今的大概。知道从古到今的大概,那当然是很好的,然而我一字也不懂。“粤自盘古”就是“粤自盘古”,读下去,记住它,“粤自盘古”呵!“生于太荒”呵!……

    ⑩应用的物件已经搬完,家中由忙乱转成静肃了。朝阳照着西墙,天气很晴朗。母亲,工人,长妈妈即阿长,都无法营救,只默默地静候着我读熟,而且背出来。在百静中,我似乎头里要伸出许多铁钳,将什么“生于太荒”之流夹住;也听到自己急急诵读的声音发着抖,仿佛深秋的蟋蟀,在夜中鸣叫似的。

    ⑪他们都等候着;太阳也升得更高了。