首页
登录
职称英语
The sun today is a yellow dwarf star. It is fueled by thermonuclear reaction
The sun today is a yellow dwarf star. It is fueled by thermonuclear reaction
游客
2023-12-27
35
管理
问题
The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth.
By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist.
Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf.
After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface. [br] The word "there" underlined in Paragraph 4 refers to ______ .
选项
A、our own planet
B、the outer surface of the sun
C、the core of a black dwarf
D、the planet mercury
答案
A
解析
词义题型见最后一段最后两句:最后一句中的there指的是上一句的主语the Earth,因此答案为A。
转载请注明原文地址:https://tihaiku.com/zcyy/3311096.html
相关试题推荐
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Amanwasplayingapianobeingpaintedpurpleandyellowandleftthereforthi
Thereactionwasinstantandoverwhelming.Socialmediaexploded,radiophone-in
Kaganmaintainsthataninfant’sreactionstoitsfirststressfulexperiencesar
Amanwasplayingapianobeingpaintedpurpleandyellowandleftthereforthi
随机试题
Allthroughtheagesthebathasbeenacreatureofgreatmystery.Batshave
Completethetablebelow.WriteNOMORETHANTHREEWORDSforeachanswer.[img]2
[originaltext]Theworldofmusichasneverbeenthesamesincetheformatio
随着工期的缩短,直接成本的变化规律是()。A.增加 B.减少 C.不变
下列哪一剧目与《女驸马》属于同类剧种()A.《花为媒》 B.《长生殿》
投标人或者其他利害关系人对评标结果有异议的,应当在()提出。A、中标候选人公示期
下面属于熊市套利做法的是()。A.买入l手3月大豆期货合约,同时卖出1手5月大
在CRT的实施过程中,如果受测者的人数超过30人时,除主测者外,应增加主测助理
汉译英:“货币”,正确的翻译为()。 A.currentB.pr
根据物权法律制度的规定,下列各项中,可以出质的有()。A.存款单 B.仓单
最新回复
(
0
)