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
61
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.
From me last paragraph we can infer that if IAU kept Pluto’s status as a planet, the number of planets in the solar system would be______.
选项
A、eight
B、nine
C、less than nine
D、more than nine
答案
D
解析
从最后一段话得知,即使将冥王星归为行星,对于太阳系包括九大行星之说也需要修改,因为更多的矮行星也将被归为行星,所以太阳系中的行星数量会大于九个。
转载请注明原文地址:https://www.kaotiyun.com/show/oYjd777K
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?
Readthefollowingparagraphsinwhichfivepeopletalkaboutbeauty.Forquestions61to65.matchthenameofeachspeaker(61
Whodoyouthinkarethetwospeakersintheconversation?
Readthetextsfromamagazinearticleinwhichfivepeoplearetalkingaboutfriendship.Forquestions1to5,matchthenameo
Whatshouldyouthinkaboutintryingtofindyourcareer?Youareprobablybetteratsomeschoolsubjectsthanothers.Thesema
Readthefollowingtextsfromanarticleinwhichfivepeopletalkedabouttheelderly.Forquestions61to65,matchthenameo
Readthefollowingtextfromadiscussioninwhichfivepersonstalkedaboutthefactorsimportanttoastudent’sstudyperforma
Scientistsfindthathard-workingpeoplelivelongerthanaveragemenandwomen.Careerwomenare【C1】______thanhousewives.Evid
Scientistsfindthathard-workingpeoplelivelongerthanaveragemenandwomen.Careerwomenare【C1】______thanhousewives.Evid
随机试题
IngmaBergman’slatestworkasascreenwriteris"Sunday’sChildren".SetinruralSwedenduringthelate1920s,thestorycent
患儿,男,2岁,诊为室间隔缺损,分流量大。护士对家长的健康教育可除外( )。
男,33岁,15年前曾发现蛋白尿,一直未检查和治疗。三周前出现恶心、呕吐,查:血压190/120mmHg,轻度浮肿,血肌酐360μmol/L,B超双肾缩小。下列生化异常不应出现的是
敷设于保护管中的电缆,应具有()。
不锈钢餐匙(非成套)()
当价格连续下降远离移动平均线,又上升至移动平均线附近再度下降时,一般可以认为这是一个买入信号。()[2012年5月真题]
李某退休后于2000年1月起承包了一家饭店,承包期为一年,按规定李某一年取得承包收入50000元,此外李某还按月领取退休工资,每月600元,作为饭店承包人,李某还按规定履行个人所得税代扣代缴义务,一年来取得扣缴手续费1000元。根据以上资料回答下列问题:
下面四个立体图形中,哪一项不能用一个平面分割为两个完全相同或互为镜像的部分?
清代儒学有所谓汉学、宋学之争,汉学即()。
关于软件测试,(31)的叙述是正确的。①测试开始越早,越有利于发现软件缺陷②采用正确的测试用例设计方法,软件测试可以做到穷举测试③测试覆盖度和测试用例数量成正比④软件测试的时间越长越好
最新回复
(
0
)