题干

最早利用地磁场指示方向的装置是图甲所示“司南”,古文《论衡•是应篇》中记载:“司南之杓(用途),投之于地,其柢(握柄)指南”。则勺柄应为该磁体的____(选填“N” 或“S”)极;某物理研究所尝试利用一块天然磁石制作一具“司南”,图乙所示为天然磁石的磁感线分布情况,则应将磁石的____(选填“A”、“B”、“C”或“D”)处打磨成勺柄。

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答案(点此获取答案解析)

S,C

同类题1

阅读下面的文言文,完成后面题。

阮籍传

    阮籍,字嗣宗,陈留尉氏人也。父瑀,魏丞相掾,知名于世。籍容貌瑰杰,志气宏放,傲然独得,任性不羁,而喜怒不形于色。或闭户视书,累月不出;或登临山水,经日忘归。博览群籍,尤好《庄》《老》。嗜酒能啸,善弹琴。当其得意,忽忘形骸。时人多谓之痴,惟族兄文业每叹服之,以为胜己,由是咸共称异。及曹爽辅政,召为参军。籍因以疾辞,屏于田里。岁余而爽诛,时人服其远识。

    籍本有济世志,属魏、晋之际,天下多故,名士少有全者,籍由是不与世事,遂酣饮为常。文帝初欲为武帝求婚于籍,籍醉六十日,不得言而止。钟会数以时事问之,欲因其可否而致之罪,皆以酣醉获免。及文帝辅政,籍尝从容言于帝曰:“籍平生曾游东平,乐其风土。”帝大悦,即拜东平相。籍乘驴到郡,坏府舍屏鄣,使内外相望,法令清简,旬日而还。

    籍闻步兵厨营人善酿,有贮酒三百斛,乃求为步兵校尉。遗落世事,虽去佐职,恆游府内,朝宴必与焉。会帝让九锡,公卿将劝进,使籍为其辞。籍沈醉忘作,临诣府,使取之,见籍方据案醉眠。使者以告,籍便书案,使写之,无所改窜。辞甚清壮,为时所重。

    籍虽不拘礼教,然发言玄远,口不臧否人物。性至孝,母终,正与人围棋,对者求止,籍留与决赌。既而饮酒二斗,举声一号,吐血数升。及将葬,食一蒸肫,饮二斗酒,然后临诀,直言穷矣,举声一号,因又吐血数升,毁瘠骨立,殆致灭性。

    籍又能为青白眼,见礼俗之士,以白眼对之。及嵇喜来吊,籍作白眼,喜不怿而退。喜弟康闻之,乃赍酒挟琴造焉,籍大悦,乃见青眼。由是礼法之士疾之若仇,而帝每保护之。

    籍嫂尝归宁,籍相见与别。或讥之,籍曰:“礼岂为我设邪!”邻家少妇有美色,当垆沽酒。籍尝诣饮,醉,便卧其侧。籍既不自嫌,其夫察之,亦不疑也。兵家女有才色,未嫁而死。籍不识其父兄,径往哭之,尽哀而还。其外坦荡而内淳至,皆此类也。时率意独驾,不由径路,车迹所穷,辄恸哭而反。尝登广武,观楚、汉战处,叹曰:“时无英雄,使竖子成名!”登武牢山,望京邑而叹,于是赋《豪杰诗》。景元四年冬卒,时年五十四。

    籍能属文,初不留思。作《咏怀诗》八十余篇,为世所重。著《达庄论》,叙无为之贵。文多不录。

同类题3

阅读理解

    Have you ever run into a careless cell phone user on the street? Perhaps they were busy talking, texting or checking updates on WeChat without looking at what was going on around them. As the number of this new “species” of human has kept rising, they have been given a new name —phubbers(低头族).

    Recently, a cartoon created by students from China Central Academy of Fine Arts put this group of people under the spotlight. In the short film, phubbers with various social identities bury themselves in their phones. A doctor plays with his cell phone while letting his patient die, a pretty woman takes selfie in front of a car accident site, and a father loses his child without knowing about it while using his mobile phone. A chain of similar events eventually leads to the destruction of the world.

    Although the ending sounds overstated, the damage phubbing can bring is real.

    Your health is the first to bear the effect and result of it. “Constantly bending your head to check your cell phone could damage your neck,” Guangming Dailyquoted doctors as saying, “the neck is like a rope that breaks after long-term stretching.” Also, staring at cell phones for long periods of time will damage your eyesight gradually, according to the report.

    But that's not all. Being a phubber could also damage your social skills and drive you away from your friends and family. At reunions with family or friends, many people tend to stick to their cell phones while others are chatting happily with each other and this creates a strange atmosphere, Beijing Evening News reported.

    It can also cost you your life. There have been lots of reports on phubbers who fell to their death, suffered accidents, and were robbed of their cell phones in broad daylight.