题干

月球与地球质量之比约为1:80,有研究者认为月球和地球可视为一个由两质点构成的双星系统,它们都围绕月地连线上某点O做匀速圆周运动。据此观点,可知月球与地球绕O点运动的线速度大小之比约为

A:1:6400

B:1:80

C:80:1

D:6400:1

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答案(点此获取答案解析)

C

同类题2

阅读理解

Boston College is a state­supportedcollege on the east coast of England which has been recruiting overseasstudents for over 20 years and now has almost 200 international students frommore than 20 different countries.You and your parents can be sure you willreceive the care and support you need to succeed at our college.

We have excellent teaching staff, withtime and patience to help you learn in a stimulating but relaxed atmosphere.We are accredited by the British Council for the quality of our Englishlanguage teaching so you can be sure your learning experience will be good.

Our new modular English course isflexible and enables you to choose the best time to join us.Not only will youcover all aspects of the English language but you will have the choice ofoption subjects such as IELTS Preparation, British Culture, Literature,Business English or Study Skills.We will assess your level of English when youarrive so you can be sure you will study with students of the sameability.Classes are small:usually12~16students so you will receive the individual attention you need to help yousucceed.

Boston College is based on two maincampuses with English courses being taught in our state­of­the­art languagebuilding convenient for our Hall of Residence on the Rochford Campus.A­Leveland International Foundation classes are taught on both Rochford and DeMontfort Campuses.Classrooms are modern and well equipped with a number of specialistfacilities for photography and video,computersuites, art and music studios and an all weather sports pitch.Both campuseshave large Learning Resource Centres, well equipped with computers for studentuse, also available for research or assignment work.Our diploma courses includecatering, hairdressing, computing and engineering, each with its own specialistfacilities.We also have a Music Centre providing teaching rooms, recordingstudio and concert hall.

Notes

diploma n.文凭

同类题4

阅读下面【甲】【乙】两文,完成下列小题。

    【甲】­ 秦王谓唐雎曰:“寡人以五百里之地易安陵,安陵君不听寡人,何也?且秦灭韩亡魏,而君以五十里之地存者,以君为长者,故不错意也。今吾以十倍之地,请广于君,而君逆寡人者,轻寡人与?”唐雎对曰:“否,非若是也。安陵君受地于先王而守之,虽千里不敢易也,岂直五百里哉?”

    秦王怫然怒,谓唐雎曰:“公亦尝闻天子之怒乎?”唐雎对曰:“臣未尝闻也。”秦王曰:“天子之怒,伏尸百万,流血千里。”唐雎曰:“大王尝闻布衣之怒乎?”秦王曰:“布衣之怒,亦免冠徒跣,以头抢地耳。”唐雎曰:“此庸夫之怒也,非士之怒也。夫专诸之刺王僚也,彗星袭月;聂政之刺韩傀也,白虹贯日;要离之刺庆忌也,仓鹰击于殿上。此三子者,皆布衣之士也,怀怒未发,休祲降于天,与臣而将四矣。若士必怒,伏尸二人,流血五步,天下缟素,今日是也。”挺剑而起。

  (选自《唐雎不辱使命》)

    【乙】谢太傅盘桓东山,时与孙兴公诸人泛海戏。风起浪涌,孙、王诸人色并遽,便唱使还。太傅神情方王,吟啸不言。舟人以公貌闲意说,犹行不止。既风转急,浪猛,诸人皆喧动不坐。公徐云:“如此,将无归!”众人即承响而坐。于是审其量,足以镇安朝野。

(选自《世说新语》

【注释】①【盘桓】徘徊,逗留。②【孙、王】孙:孙兴公;王:指王羲之。③【遽】惊慌。④【唱】提议。⑤【王】同“旺”,兴致高。⑥【承响】响应,应声。