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
44
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.
The sentence "It is always hard for a small fish to live in big pond" quoted at the beginning of the passage is used to______.
选项
A、tell us small fish can hardly survive in the big pond
B、tell us the size of an object really matters
C、mean that small planet can hardly exist in the solar system
D、explain the disappearance of Pluto in the solar system
答案
B
解析
文中第一段第二句提到,冥王星脱离行星家族证明了天体的体积的重要性。
转载请注明原文地址:https://kaotiyun.com/show/IYjd777K
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
Whatdidthemanmean?
Thefollowinggraphshowsthepercentageofpopulardes-sertsselectedinschoolcafeteria.Lookatthegraphandwriteanessa
Whatarethetwospeakersdoing?
Readthefollowingtextsfromanarticleinwhichfivepeopletalkedabouttheelderly.Forquestions61to65,matchthenameo
StandardEnglishisthevarietyofEnglishwhichisusuallyusedinprintandwhichisnormallytaughtinschoolsandtonon-nat
Publicimage【C1】______tohowacompanyisviewedbyitscustomers,suppliers,andstock-holders,bythefinancialcommunity,by
Publicimage【C1】______tohowacompanyisviewedbyitscustomers,suppliers,andstock-holders,bythefinancialcommunity,by
TheManofManySecrets—HarryHoudini—wasoneofthegreatestAmericanentert-ainersinthetheaterthiscentury.Hewasamanf
Scientistsfindthathard-workingpeoplelivelongerthanaveragemenandwomen.Careerwomenare【C1】______thanhousewives.Evid
Scientistsfindthathard-workingpeoplelivelongerthanaveragemenandwomen.Careerwomenare【C1】______thanhousewives.Evid
随机试题
Mostparents,Isuppose,havehadtheexperienceofreadingabedtimestorytotheirchildren.Andtheymusthave【C1】______howd
A、水提醇沉法B、醇提水沉法C、醇提醚沉法D、铅盐沉淀法E、酸提碱沉法从植物药材乙醇提取液中使苷类沉淀析出而脂溶性杂质可存留在母液中的方法为()
电力系统的频率主要取决于()。
某市政府拟投资建一大型垃圾焚烧发电站工程项目。该项目除厂房及有关设施的土建工程外,还有全套进口垃圾焚烧发电设备及垃圾处理专业设备的安装工程。厂房范围内地质勘察资料反映地基地质条件复杂,地基处理采用钻孔灌注桩。招标单位委托某咨询公司进行全过程投资管理。该
关于税务代理法律责任的说法,正确的是()。
下列经营项目中,符合税法规定的应税营业额的是()。
未成年人的父母或者其他监护人对未成年人的法制教育负有()责任。
在学校你学到了什么?你希望单位给你提供什么样的环境?
A、继续工作B、不工作了C、想开公司D、去看朋友B“结婚以后就不再工作”中“不再”,表示从某个时间点以后永远不……,所以选择B。
A、Sherarelymakesmistakes.B、Herbossishardtoworkwith.C、Shealwaystellsotherswhatshethinks.D、Sheregrettedhaving
最新回复
(
0
)