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
2011-03-26
43
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 o pinion that as the size and number of sun spots increased, the overall energy sent out by the sun would de crease. 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://kaotiyun.com/show/yZvC777K
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
钱钟书的小说作品是【】
Mrs.Smithtreatedherlittledogquite______.Fromitsexperience,thedogfoundthat______.
Ihavecometounderstandthatallrightscarrywiththe______(correspond)responsibilities.
Icanrememberalltheirnames,andso______myteacher.
Everyonewantstobehealthyandhappy.【B1】,illnessoraccidentsmayoccurwithoutanywarning.Frequentlythepersonwhois
(AslongasyoukeepupyourEnglishstudy),you’llcertainlymakegreaterprogress.
Nearlyhalfofthe______(bore)audiencehadleftthemeetingbeforetheclosingaddress(闭幕词).
Thispassagedealsmostlywith______.Register,inthispassage,mostnearlymeans______.
Somepeoplethinktheyhaveananswertothetroublesofautomobilecrowdinganddirtyairinlargecities.Theiransweristhe
随机试题
HisanswerwassoconfusingthatIcouldhardlymakeany______ofitatall.
上消化道出血定位应首选
A.清热化痰,理气止咳B.润肺清热,理气化痰C.清热化痰,宽胸散结D.化痰息风,健脾祛湿E.燥湿清气,化痰软坚半夏白术天麻汤的功效是
A.居经B.激经C.暗经D.暗产E.避年
在首次业主大会会议召开前(),业主大会筹备组应当将筹备工作情况以书面形式在物业管理区域内公告。
从记忆方式的发展来看,高中生擅长采用的记忆方式是()
市场会不断创造诱惑让你花钱,每一个橱窗、货架都是大量市场实验的最优方案。很常见的例子,为何鸡蛋、牛奶被放到超市的深处?因为这是人们最普遍的购买需求,你不得不穿过一排又一排货架,不知不觉买了很多计划外的东西。下列哪种做法能作为本文观点的佐证?(
片上系统(SOC或SoC)是目前广泛使用的一种嵌入式处理芯片,下面有关叙述中错误的是()。
Iwasadvisedtoarrangeforinsurance______Ineededmedicaltreatment.
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonlyslightlyfromplacetoplace.Nevertheless,someof
最新回复
(
0
)