首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
It is always hard for a small fish to live in a big pond. Pluto’s recent departure from the classical planet family clearly prov
It is always hard for a small fish to live in a big pond. Pluto’s recent departure from the classical planet family clearly prov
admin
2015-01-28
51
问题
It is always hard for a small fish to live in a big pond. Pluto’s recent departure from the classical planet family clearly proves that size really matters.
Astronomers voted on August 24 to give a definition to the word "planet", and Pluto turned out to be only a " dwarf planet"(矮行星). After weeks of heated debate, over 2, 500 astronomers from 73 countries voted on the definition of a "planet" at a conference of the International Astronomical Union(IAU). According to the definition, a planet must have a clear neighborhood around its orbit. Pluto has widely been considered a planet since its discovery in 1930. Unfortunately, it has a special orbit which overlaps with Neptune’s. It is all because, compared with Neptune, Pluto is very small. It is attracted by Neptune’s gravity when the two planets get closer.
According to IAU, a "dwarf planet" should have an orbit around the sun. It will not have a clear neighborhood a-round its orbit, and must not be a satellite. The new classification means that the science textbooks will have to be updated. The solar system is now made up of the eight "classical planets", together with a number of dwarf planets. The classical planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Astronomers sent an advanced telescope into space, and found a belt of objects, which lies beyond Neptune. The belt contains nearly 1, 000 objects, including Pluto. As they continued the exploration, scientists recendy discovered at least 41 dwarf planets at the edges of the solar system. There are at least two objects of a similar size to Pluto.
It seems that even if the IAU had kept Pluto’s status as a planet, the classical theory of nine planets in the solar system would have had to be changed. More dwarf planets of a similar size to Pluto would join the family of planets. Scientists will probably find many more dwarf planets.
According to the new classification, the solar system includes______.
选项
A、eight classical planets and forty one dwarf planets
B、nine classical planets and at least forty one dwarf planets
C、eight classical planets and a number of dwarf planets
D、1, 000 objects
答案
C
解析
参见第三段第四句话。
转载请注明原文地址:https://kaotiyun.com/show/EYjd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Whatdoweknowaboutthespeaker’sfriend?
Howdidthespeakerfeelwhenhisfatheraskedhimtohelpcutgrass?
PresidentCoolidge’sstatement,"ThebusinessofAmericaisbusiness,"stillpointstoanimportanttruthtoday-thatbusinessin
Whatistheprobablerelationshipbetweenthetwospeakers?
Whatistheprobablerelationshipbetweenthetwospeakers?
Publicimage【C1】______tohowacompanyisviewedbyitscustomers,suppliers,andstock-holders,bythefinancialcommunity,by
Publicimage【C1】______tohowacompanyisviewedbyitscustomers,suppliers,andstock-holders,bythefinancialcommunity,by
Publicimage【C1】______tohowacompanyisviewedbyitscustomers,suppliers,andstock-holders,bythefinancialcommunity,by
Scientistsfindthathard-workingpeoplelivelongerthanaveragemenandwomen.Careerwomenare【C1】______thanhousewives.Evid
FollowingMartinWedell’spiece"Localteacherornativespeaker?"nowisperhapsagoodtimetoexplorethediscomfortoverthe
随机试题
下列程序的输出结果是()main(){charb[]="Hel10,friend";b[5]=0;printf("%s",b);}
我国封建社会地主占制的特点是什么?
血瘀发热的首选方为血府逐瘀汤,若发热较甚者,可加
A、山药、黄精B、龟甲、骨碎补C、鹿茸、阿胶D、麦冬E、南沙参、北沙参被称为凉补之品的是
在心肺复苏时,如果通气后患者胸部仍然不能起伏,最可能的原因为下列哪项
秦某因犯贪污罪被判决有期徒刑7年并附加没收财产,下列说法正确的有:
建设项目总承包单位内部关系的处理,如果项目中标,设计单位除获得设计费之外,还可以参加项目利润的分成,一般可以得到利润的( )左右。
A.条件(1)充分,但条件(2)不充分B.条件(2)充分,但条件(1)不充分C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分D.条件(1)充分,条件(2)也充分E.条件(1)和(2)单独都不充分,两个条件联合起来也不充分
以下关于VB的叙述中,错误的是
Itseemstomethattoday’sprime-timeleaderneedsatop-5listthatclearlylaysouthisorherpriorities.Whetheryou’rerun
最新回复
(
0
)