首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
It seems to shine unchangingly, pouring out a constant light year after year. But the sun may not be nearly so stable as we supp
It seems to shine unchangingly, pouring out a constant light year after year. But the sun may not be nearly so stable as we supp
admin
2012-08-05
20
问题
It seems to shine unchangingly, pouring out a constant light year after year. But the sun may not be nearly so stable as we suppose, It is now thought to move quickly and irregularly and change in long-term cycles, growing dimmer and then brighter with each passing year. Some even fear that its frequent changing behavior would have a great influence on the Earth’s climate.
The source of the sun’s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature.
"We don’t yet know what causes sun spots, "he says, "but we now think they’re areas of high-level magnetism that come up from the sun’s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out." As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular surface patches.
Sun spot activity generally fluctuates in steady, 11-year cycled. Scientists have long formed the opinion that as the size and number of sun spots increased, the overall energy sent out by the sun would decrease. Indeed, recent studies confirmed it, revealing that during peak periods of sun spot activity, the Earth experiences a small drop that can be seen clearly in received solar energy.
Could such a small drop in energy have an effect here on earth? Perhaps some scientists think the world temperature could fall by as much as 0.2 during periods of high solar magnetism... enough to cause significant fluctuations in weather patterns.
According to the passage, it is believed that the sun ______ .
选项
A、moves in a quick but steady way year after year
B、sends out less and less heat and light with each passing year
C、radiates the same amount of light every year
D、might have a strong influence on the weather patterns
答案
D
解析
转载请注明原文地址:https://jikaoti.com/ti/a5uGFFFM
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Allthestudentsenviedhim______havingsucceededintheTOFELtest.
Itiswidelybelievedthatthepullofgravityonafallingraindropchanges______roundshapeintoateardropshape.
Hospitalstaffburstintocheersafterdoctorscompleteda-houroperationtohave______one-year-oldtwinsatthehead.
Heisworkinghard,_____willmakehimpassthefinalexam.
Itisnaturalthatyoungpeopleareoftenuncomfortablewhentheyarewiththeirparents.Theysaythat【61】parentsdon’t【62】them
FromMondayuntilFridaymostpeoplearebusyworkingorstudying,butintheeveningsandonweekendstheyarefreeandenjoy
Thedoghasalwaysbeenconsideredman’sbestfriend.Alwaysnotedforbeingparticularlyfaithfulinwatchingoverchildren,he
Thedoghasalwaysbeenconsideredman’sbestfriend.Alwaysnotedforbeingparticularlyfaithfulinwatchingoverchildren,he
Mostdictionarieswilltellyouanumberof【21】aboutalanguage.Therearethreethingsinparticularthat【22】important.Theset
It’sinterestinghowlittlemostofUSknowaboutourancestorsoraboutthehistoryofourfamily.Ifyou【56】tobenobility(贵族
随机试题
Soldiersandothermilitarypeoplewearuniformswithvariousothersymbolstoindicatetheirstatus.Butinthebusinessworld
听觉上最自然、最容易分辨的最小的语音单位是()
下列选项中属于显现的物质层组织文化的是()
正常肺部叩诊音为【】
至宝丹最适宜于哪种原因引起的窍闭神昏
平均寿命τ是指放射性原子核的平均生存时间。平均寿命与半衰期的关系为
动物严重大面积烧伤时可引起
(2007)比较勒·柯布西耶与赖特两人的城市规划理论,他们的共性是()。
用转账支票归还欠A公司货款50000元,会计人员编制的记账凭证为:借记“应收账款50000元”,贷记“银行存款50000元”,审核并已登记入账,该记账凭证()。
我国行政管理的权力结构的特征是()。
最新回复
(
0
)