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
2023-07-17
47
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、About 10,000 °F.
B、About 20,000,000°F.
C、About 2,000,000°F.
D、About 20,000°F.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2844022.html
相关试题推荐
[originaltext]WhenmysonRyansawaT-shirtonsalefor5dollarsmarkedd
[originaltext]WhenmysonRyansawaT-shirtonsalefor5dollarsmarkedd
[originaltext]WhenmysonRyansawaT-shirtonsalefor5dollarsmarkedd
[originaltext]Oneofthefirstquestionsanybodyasksaboutanew-bornis“what
[originaltext]Oneofthefirstquestionsanybodyasksaboutanew-bornis“what
[originaltext]M:Afineday,isn’tit?W:Yeah.Howiseverythinggoing,Mike?
[originaltext]M:ProfessorJohnson’slectureissoboring.Idon’tthinkit’su
[originaltext]M:ProfessorJohnson’slectureissoboring.Idon’tthinkit’su
[originaltext]M:ProfessorJohnson’slectureissoboring.Idon’tthinkit’su
[originaltext]M:ProfessorJohnson’slectureissoboring.Idon’tthinkit’su
随机试题
[originaltext]Thecostisgoingupforjustabouteverything,andcolleget
PASSAGEONE[br]WhatdoesSmiththinkofthetwoshamefulincidentsMarkTwain
Supermarketsaretryingoutnewcomputersthatmakeshoppingcartsmoreintel
以下指标中不属于光缆系统的测试指标的是()A.最大衰减限值 B.回波损耗限
可以防治夜盲症的是A.维生素A B.维生素B C.维生素C D.维生素D
农村居民在哪方面的人均消费支出比重一直大于城镇居民?() A.食品、交通
根据有关规定,必须成立药事管理委员会的是A:三级医院 B:二级以上医院 C:
尽管工作压力大,事务繁杂,何老师始终保持积极工作态度,用微笑面对每一个学生。这体
某病患者(8人)潜伏期(天)如下:2,3,3,3,4,5,6,30,则平均潜伏期
税务行政处罚的主体包括( )。A.县级税务机关 B.设区市税务机关 C.各
最新回复
(
0
)