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
38
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 "fueled" underlined in Paragraph 1 most probably means ______ .
选项
A、powered
B、bombarded
C、created
D、pushed
答案
A
解析
词义题型
转载请注明原文地址:https://tihaiku.com/zcyy/3311089.html
相关试题推荐
Theskyhadaneerieyellow-orangehue,withthesunglowingbehindapeculiarh
Emotionisafeelingaboutorreactiontocertainimportanteventsorthough
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Thesuntodayisayellowdwarfstar.Itisfueledbythermonuclearreaction
Amanwasplayingapianobeingpaintedpurpleandyellowandleftthereforthi
随机试题
【B1】[br]【B7】A、crashedB、hitC、damagedD、burnedupDhit和damaged都是及物动词,而此处却无宾语;c
Iaskedsuccessfulpeoplewhatthesecretoftheirsuccesswas.I【B1】______a
[originaltext]Canyoureallymakenewfriendsasanadult?Imean,there’splen
ACompany’sBattletoShowI
患儿女,9岁,因发热、纳差11天入院,病程中有腹泻2~4次/天,为稀糊便,无黏液
共用题干 FederalDepositInsuranceCorporat
期货公司变更法定代表人的,应当向()提交变更法定代表人申请书等申请材料。A.住
临床上最多见的鳃裂囊肿来源于A.第一鳃裂 B.第二鳃裂 C.第三鳃裂 D.
货币政策中介目标可以选择()。A.税率 B.存款准备金率 C.货币供应量
混凝土的耐久性主要体现在()。A.抗压强度 B.抗折强度 C.抗冻等级
最新回复
(
0
)