atmosphere

TheEarth'sAtmosphere

Unlessit'srainingorthewindisblowing,wedon'tusuallypaymuch

attentiontotheatmosphere,theblanketofairthatsurroundsthe

,withouttheatmosphere,theEarthwouldbeadesolate

(荒芜的)planetwithnosignsoflife!

除非是下大雨或者刮大风,我们通常不重视那层像毯子一样环绕着地

球的大气。然而,没有大气,地球就会变成没有生命迹象的荒凉的星球!

Theatmosphereplaysveralrolesinhelpingtomakelifepossible.

First,theatmosphereprovidesthethreegasnecessaryforlife:

oxygen,nitrogen,mals,including

ourlves,enandcarbondioxideareboth

portantatmosphericgasinclude

argon,neon,helium,andhydrogen.

大气为创造适合生命生存的环境扮演着很多角色。首先,大气为生命

提供所需的三种气体:氧气、氮气和二氧化碳。包括我们自己的所有

的动物都呼吸氧气。而氮气和二氧化碳都是植物生长所需要的。其次

大气中还包括氩、氖、氦和氢。

Second,theatmospherealsoprotectsusfrommostofthesun's

high-energyultravioletlightrays,gh

theraysareonlyasmallpartofthesunlightstrikingtheEarth,

r,99percentofall

ultravioletraysareabsorbedbeforetheyreachtheEarth'ssurface.

Theyareabsorbedbyanatmosphericgas,calledozone,atypeof

nelayersurroundstheEarthbutismuch

thinnerovertheNorthandSouthPolesthanoverotherregionsof

theEarth.

第二,大气还可以保护我们免受来自太阳的大部分高强度致命的紫外

光线。虽然这些射线是只是日光照射地球的一小部分,但他们是非常

危险的。然而,99%的紫外线在他们到达地球的表面前被大气中一个

叫做臭氧的气体所吸收。它是氧气的一个类型。臭氧包围着地球,但

是位于北极和南极的臭氧层薄于地球的其他地区

Theonepercentoftheultravioletlightintheatmospherethatdoes

reachtheEarth'ssurfaceisknowntocausunburnandisnow

eofthis,

doctorsrecommendthatpeoplelimittheamountoftimetheyspend

indirectsunlightandwearasuntanlotion(防晒油)thatblocksthe

ultravioletrayswhentheydosunbathe.

百分之一的紫外光在大气中达到地球表面都会导致晒伤,现在对于很

多人来说也导致皮肤癌。正因为如此,医生建议人们做日光浴时应控

制阳光直射的时间和涂抹能够阻挡紫外线的防晒油。

Finally,theatmospheregeneratesalltypesofweathersuchas

asahugeenergymachine,

changingsunlightintootherformsofenergysuchasheatandwind.

Aspartofthisrole,theatmosphereregulatesthetemperatureon

theEarth'tallowsonly46percentofthesunlight

strikingittopassthroughandactuallyreachtheEarth'ssurface.

Second,carbondioxidegasintheatmospherecontrolstheamount

ofwarmthontheEarth'ssurfacethatisallowedtoradiate(发散)

etwocontrollingdevices,theatmosphere

regulatestheEarth'ssurfacetemperature.

最后,大气中生成所有类型的天气如蓝天,风暴。它作为一个巨大的能

源机,把阳光转变成其他形式的能量，如热、风。这个角色的一部分

调节地球表面气候的温度。首先，它只允许直射阳光的46%通过到

达地球的表面。第二,二氧化碳气体在大气中控制地球表面的温度,允

许多余的温度辐射(发散)回太空。大气层通过这两个功能控制调节地

表的温度。

Choothebestanswerstothefollowingquestions.选择最好的回

答下列问题。

Whichofthefollowingistrueaccordingtothepassage?根据课文

下列哪个选项是正确的?

TheozonelayerismuchthickeroverNorthAmericathanoverthe

NorthPole在北美的臭氧层要比在北极的更厚

Ozoneisatypeofanitrogengas.

Ozonecanabsorbsomeultravioletraysbeforetheyreachthe

Earth'ssurface.

Ozonecanprotectusfromanythingharmfultoourlife.

Themainideaofthethirdparagraphisthat（第三段的主要观点

是,）.

theEarthissurroundedbyalayerofozone

99percentofallultravioletlightraysthatreachtheEarth'ssurface

areabsorbedbytheozonelayer

theozonelayerprotectspeoplefromthesun'shigh-energy

ultravioletlightrays臭氧层保护人们免遭来自太阳的高强度紫外光线

照射

ozoneisanatmosphericgaswhichsurroundstheEarth

Accordingtothearticle,carbondioxide根据这篇文章,二氧化碳

isalessimportantatmosphericgas

controlstheamountofwarmthontheEarth'ssurface控制量的地球

表面上的温暖

allowsonly46percentofsunlighttoreachtheEarth'ssurface

actslikeahugeenergymachine

Doctorssuggestthat(医生建议).

peopleshouldstayawayfromthesunlighttoprotectthemlves

fromthesunburn

peopleshouldblocktheultravioletrayswhentheydosunbathe

peopleshouldwearasuntanlotionunderdirectsunlight在日光照射

下人们应该涂抹防晒油

peopleshouldknowthatskincancerresultsfromsunbathing

thwouldbeadesolateplanetwithouttheatmosphere

becau（没有大气层地球将是一个荒凉的星球,因为）

theatmosphereismainlycompodofoxygen,hydrogenand

nitrogen,whichareindispensabletoourlife

theatmosphereplaysveralrolesinmakinglifepossible大气为创

造适合生命生存的环境扮演着众多角色

theatmosphereallowsonlyharmlessraystoreachtheEarth

theatmospherecontrolstheamountofwarmthontheEarth's

surface