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
外语
A、Formation of raindrops in the air. B、Formation of vapor water in the air. C、Development of air pollution. D、Increase of raindr
A、Formation of raindrops in the air. B、Formation of vapor water in the air. C、Development of air pollution. D、Increase of raindr
admin
2009-09-12
32
问题
Would the world really be so much better off if there were no dust? The answer is in some ways, yes, in some ways, no. What is dust anyway? It consists of particles of earth, or other solid matter, which are light enough to .be raised and carried by the wind. Where do these particles come from? They might come from dead plants and animal matter, from sea salt, from desert or volcano sand and from ashes. For the most part, dust is not a very desirable or beneficial thing. But in one way, it helps make the world more beautiful. The lovely colors of the dawn depend to a great extent on the amount of dust that is present in the air. Particles of dust in the upper air reflect the sun’s rays. This makes its light visible on earth an hour or two after sunset. But different colors which make up the sun light are bent .at different angles as they are reflected by the dust and water steam particles. Sunsets are red, because these particles bent the red rays of the sun in such a way that they are the last rays to disappear from view. Another useful function of dust has to do with ram. The vapor water in the air would not become a liquid very readily, if it did not have the dust particles serving as centers for each drop of water. Therefore, clouds, mist, fog and rain are largely formed of an infinite number of moisture particles of dust.
选项
A、Formation of raindrops in the air.
B、Formation of vapor water in the air.
C、Development of air pollution.
D、Increase of raindrops.
答案
A
解析
[听力原文]
What is another function of dust according to the speaker?
根据四个选项可推测问题可能询问某物的“作用”。本题关键句为“Another useful function of dust...centers for each drop of water.”灰尘的另一个功能和下雨有关。如果没有灰尘作为雨滴的核心,空气中的水蒸气不会很容易的变成液体落下。因此可知灰尘的另一个作用是成雨。故选项A)为正确答案。
转载请注明原文地址:https://jikaoti.com/ti/dhDFFFFM
0
大学英语四级
相关试题推荐
Afewweeksago,awell-meaningprofessortriedtoexplainthephysiologicalprocessbehindvirusesandthehumanbodyinatwee
A、Utilizingartificialintelligencetofindapowerfulnewantibiotic.B、Discoveringbacteriawhichareresistanttoallknowna
SinceAmericanidolstarTarynSouthernstartedcomposingmusicwithAIin2017,musiciansallovertheworldhavebegunwonderi
Formanypeople,onmanyoccasions,foodisatrouble,especiallywhentryingtoeatwell.Supposewehadadefaultmealthatwa
A、Itisdesignedbyanenvironmentalgroup.B、ItisfundedbytheGlobalAgendaCouncil.C、Itisthefirstglobalmeasureofoce
I’vetwicebeentocollege-admissionswars,andasIsurveythebattlefield,somethingdifferentishappening.It’sone-upmanshi
A)Dinosaurs,StarWars,trainschedules,Disneyprincesses,maps,LEGO—subjectssuchasthesecanbecomeall-consumingpassions
A、Itwillwasteyourtime.B、Itwilldistractyourattention.C、Itwillharmyoureyes.D、Itwilldecreaseyourefficiency.B
A、Writinghelpsrelievestress.B、Cancercanbecured.C、Writingimprovestreatment.D、Writershardlyhavecancer.A
Whentherightpersonisholdingtherightjobattherightmoment,thatperson’sinfluenceisgreatlyexpanded.Thatisthepos
随机试题
患儿,8岁。右下第一恒磨牙萌出2/3,颊沟深龋洞,牙龈覆盖颊沟1/2,应怎样治疗
必须按照国家药品标准和国务院药品监督管理部门批准的生产工艺生产的药品有
房地产开发商的利润来自于租售的收入和工程成本的差价,所以降低工程成本就能增加开发商利润。()
根据《代理记账管理暂行办法》规定,下列各项中,属于代理记账机构可以接受委托,代表委托人办理的业务有()。
A、 B、 C、 D、 A如下图所示,①和②为相邻面,①和⑥为相对面,故三个阴影面不能同时出现,排除B项。同理,③、④为相邻面,③、⑤为相对面,故三个点状面不能同时出现,排除C项。D项右侧面的点状面和空白面位
苏南冲突
要在8×8的棋盘上摆放8个“皇后”,要求“皇后”之间不能发生冲突,即任何两个“皇后”不能再同一行、同一列和相同的对角线上,则—般采用(62)来实现。
下列网络互连设备中,属于物理层的是(26)________________。
PASSAGETHREEWhatdoes"fringe"inParagraph2mean?
A、Thestoryofasurvivor.B、Thepowerofthetsunami.C、Therescueofasurvivor.D、Thestrugglebetweenmanandnature.A主旨大意题
最新回复
(
0
)