首页
登录
职称英语
[originaltext] Our sun is exactly an orange, dwarf star. Although it is not
[originaltext] Our sun is exactly an orange, dwarf star. Although it is not
游客
2024-02-18
29
管理
问题
Our sun is exactly an orange, dwarf star. Although it is not nearly the hottest star known, the surface temperature is about 10,000°F, and that of its interior is thought to be in the range of 20,000,000°F. We commonly think of the sun as burning; yet it is too hot to burn and is composed of elemental gases.
The sun is more than 865,000 miles in diameter and has a mass one third of a million times greater than the earth’s.Scientists believe that it is two billion years old and, instead of cooling, is still getting hotter. Perhaps, within next two billion years, it will reach a temperature of sufficient intensity to destroy the earth.
The sun’s halo is almost as hot as its interior. Its tongues of fire leap outward a half-million miles from the sun’s surface at speeds reaching 250,000 miles an hour. Fortunately these tongues do not travel at their full speeds to earth ,nor are their terrific temperatures transmitted through space. Some of the energy from these disturbances does reach our atmosphere ,however, and is believed to changes in weather.
选项
A、Masses.
B、Molten lava.
C、Gasses.
D、Unknown substances.
答案
C
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3460287.html
相关试题推荐
[originaltext]M:Soyouworkinapub.W:Yes,that’sright.M:What’sitlike?
[originaltext]M:Soyouworkinapub.W:Yes,that’sright.M:What’sitlike?
[originaltext]W:Hi,Bill,howisitgoing?M:Oh,hi,Jane.I’mOK.Howabout
[originaltext]W:Hi,Bill,howisitgoing?M:Oh,hi,Jane.I’mOK.Howabout
[originaltext]Choosingwhattoeatseemslikeasimpledecision,butvariou
[originaltext]Choosingwhattoeatseemslikeasimpledecision,butvariou
[originaltext]StephenWilliamHawkingwasbornon8January1942inOxford,
[originaltext]StephenWilliamHawkingwasbornon8January1942inOxford,
[originaltext]StephenWilliamHawkingwasbornon8January1942inOxford,
[originaltext](30)Mostschoolsaretryinghardtoupgradetheirlunchprog
随机试题
Australianresearchershavediscoveredelectroreceptors(sensoryorgansdesigned
ThechoreographerGeorgeBalanchine(created)morethan150(works)fortheNew
Onecalledherbossa"bitchfromhell"whileanotheradmitted"lyingthroug
[originaltext]M:SomeonejustcalledaskingforMargaret.W:Didn’ttheperson
生产准备的主要内容不包括()。A.组织准备 B.安全准备 C.技术准备 D
资产运营能力分析指标主要包括( )。A.流动比率 B.应收账款周转率 C.
以下腧穴中,善于治疗遗尿、小便不利、癃闭等泌尿系病证的腧穴是A.中脘 B.神阙
下列说法中,错误的是A.心其华在面 B.脾在液为唾 C.肺在体合皮 D.肝
阿托品中毒时的解救措施中,错误的是A.洗胃、导泻B.注射拟胆碱药对抗其周围症状C
教育心理学研宄学习迀移有什么意义?
最新回复
(
0
)