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
82
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/3460286.html
相关试题推荐
[originaltext]W:Oh,Jack.I’mgladIcaughtyou.IwanttotellyouIhaveto
[originaltext]W:Oh,Jack.I’mgladIcaughtyou.IwanttotellyouIhaveto
[originaltext]W:Oh,Jack.I’mgladIcaughtyou.IwanttotellyouIhaveto
[originaltext]W:Oh,Jack.I’mgladIcaughtyou.IwanttotellyouIhaveto
[originaltext]W:DoesJohnknowtheclassishavingasurprisepartyforhimwh
[originaltext]W:DoesJohnknowtheclassishavingasurprisepartyforhimwh
[originaltext]W:DoesJohnknowtheclassishavingasurprisepartyforhimwh
[originaltext]W:DoesJohnknowtheclassishavingasurprisepartyforhimwh
[originaltext]Tomwasoneofthebrightestboysintheyear,withsupportiv
[originaltext]Tomwasoneofthebrightestboysintheyear,withsupportiv
随机试题
Operationswhichleftpatients______andinneedoflongperiodsofrecoveryth
SocialHistoryoftheEastEndofLondon1.lst-4thcent
n-3系列脂肪酸是按( )分类。A.脂肪酸饱和程度 B.脂肪酸碳链长度 C
【教学过程】 (一)开始部分 1.课堂常规:体委整队,报告人数,师生问好,教师简要介绍教学内容,检查服装,安排见习生。 2.导入:相信大家都知道我国
下列关于国债按资金用途分类,说法正确的有()。 ①赤字国债是指用于弥补
党的十七大报告指出:中国特色社会主义道路,就是在中国共产党领导下,立足基本国情,
某上市房地产开发公司投资开发了一大型综合楼,包括商场、宾馆、写字楼和公寓四种类型
“自由法国”的领导人是( )A.贝当 B.达拉第 C.戴高乐 D.甘末林
血小板在生理止血中的作用是( )。A.血小板黏附于受损血管 B.血小板聚集形
关于中枢化学感受器的叙述,下列哪项是错误的A.位于延髓腹外侧浅表部位 B.可以
最新回复
(
0
)