- 阅读理解A
题干：Intheatmosphere,carbondioxideactsratherlikeaone-waymirrorortheglassintheroofofagreenhousewhichallowsthesun’sraystoenterbutpreventstheheatfromescaping.Accordingtoaweatherexpert’sprediction,theatmospherewillbe3°Cwarmerintheyear2050thanitistoday,ifmancontinuestoburnfuelsatthepresentrate.Ifthiswarminguptookplace,theicecapsinthepoleswouldbegintomelt,thusraisingsealevelseveralmetersandseverelyfloodingcoastalcities.Also,theincreaseinatmospherictemperaturewouldleadtogreatchangesintheclimateofthenorthernhemisphere,possiblyresultinginanalterationoftheearth’schieffoodgrowingzones.Inthepast,concernaboutaman-madewarmingoftheearthhasconcentratedontheArcticbecausetheAntarcticismuchcolderandhasamuchthickericesheet.ButtheweatherexpertsarenowpayingmoreattentiontoWestAntarctic,whichmaybeaffectedbyonlyafewdegreesofwarming:inotherwords,byawarmingonthescalethatwillpossiblytakeplaceinthenextfiftyyearsfromtheburningoffuels.SatellitepicturesshowthatlargeareasofAntarcticicearealreadydisappearing.Theevidenceavailablesuggeststhatawarminghastakenplace.Thisfitsthetheorythatcarbondioxidewarmstheearth.However,mostofthefuelisburntinthenorthernhemisphere,wheretemperaturesseemtobefalling.Scientistsconclude,therefore,thatuptonownaturalinfluencesontheweatherhaveexceededthosecausedbyman.Thequestionis:Whichnaturalcausehasmosteffectontheweather?Onepossibilityisthevariablebehaviorofthesun.Astronomersatoneresearchstationhavestudiedthehotspotsand‘cold’spots(thatis,therelativelylesshotspots)onthesun.Asthesunrotates,every27.5days,itpresentshotteror‘colder’facestotheearth,anddifferentaspectstodifferentpartsoftheearth.Thisseemstohaveaconsiderableeffectonthedistributionoftheearth’satmosphericpressure,andconsequentlyonwindcirculation.Thesunisalsovariableoveralongterm:itsheatoutputgoesupanddownincycles,thelatesttrendbeingdownward.Scientistsarenowfindingmutualrelationsbetweenmodelsofsolarweatherinteractionsandtheactualclimateovermanythousandsofyears,includingthelastIceAge.TheproblemisthatthemodelsarepredictingthattheworldshouldbeenteringanewIceAgeanditisnot.Onewayofsolvingthistheoreticaldifficultyistoassumeadelayofthousandsofyearswhilethesolareffectsovercometheinertia(惯性)oftheearth’sclimate.Ifthisisright,thewarmingeffectofcarbondioxidemightthusbeservingasausefulcounterbalancetothesun’sdiminishingheat.
题目： Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling. This is（）. - A 、mainly because the levels of carbon dioxide are rising
- B 、possibly because the ice caps in the poles are melting
- C 、exclusively due to the effect of the inertia of the earth’s climate
- D 、partly due to variations in the output of solar energy
扫码下载亿题库
精准题库快速提分
参考答案【正确答案：D】
北半球的carbon dioxide的浓度较高，按理说这半球的温度更高才对，但是情况正相反，说明有carbon dioxide以外的其他因素也影响大气温度的变化。作者在第六段末尾指出：its heat output goes up and down in cycles, the latest trend being downward。在第七段作者又说，根据太阳天气交互作用模型现在应该是一个新的冰期时代的开始，但实际上又不是，说明大气中不断上升的carbon dioxide浓度又使得气温中不断消失的太阳热量得以平衡。因此，本题正确答案是D。A所导致的结果与原文所要探讨的正好相反；B与原文内容无关；C说的太绝对，如果果真如此的话，现在应该已进入新的Ice Age了!
您可能感兴趣的试题- 1 【单选题】The fuel of the continental missile is supposed to be（）by this device.
- A 、ignited
- B 、lighted
- C 、fired
- D 、inspired
- 2 【单选题】The rich ( )not always happy, although the poor( )for all.
- A 、are...pay
- B 、is...pays
- C 、is...pay
- D 、pay...is
- 3 【单选题】Although many a strong man( )got lost before such a temptation, still there( )a greatmany who( )managed to resist it.
- A 、has...are...have
- B 、have...are...have
- C 、has...is...has
- D 、have...is...have
- 4 【单选题】Although Peter is clever ,（）work hard.
- A 、he doesn't
- B 、he isn't
- C 、but he doesn't
- D 、but he isn't
- 5 【阅读理解A】The main problem of the round-the-clock working system lies in（）.
- A 、the inconveniences brought about to the workers by the introduction of automation
- B 、the disturbance of the daily life cycle of workers who have to change shifts too frequently
- C 、the fact that people working at night are often less effective
- D 、the fact that it is difficult to find a number of good night workers
- 6 【阅读理解A】 The appropriate title for the text is（）.
- A 、Maturity Results from Flexibility
- B 、Formal Education Keeps a Heart Young
- C 、Immaturity Level are Rising
- D 、Adulthood Comes in the Hard Way
- 7 【阅读理解A】 Which of the following is mentioned in the passage?（）
- A 、strict law against computer crimes must be enforced
- B 、Companies need to impose restrictions on confidential information
- C 、Companies will guard against computer crimes to protect their reputation
- D 、Companies usually hesitate to uncover computer crimes
- 8 【阅读理解A】 The main purpose of Paragraph 3 is to（）.
- A 、examine how one of Aesop's fables sheds light on certain facets of Greek belie
- B 、dissect one of Aesop' s fables in order to study the elements that make up Greek mythology
- C 、learn from the lesson Presented in one of Aesop's most well-known fables
- D 、illustrate a fable typical of Aesop's style, so as to examine how one goes the meaning behind it
- 9 【阅读理解A】 The main point of this text is（）.
- A 、 Aesop' s fables provide a valuable glimpse into early Greek thought and belief
- B 、the most efficient and reliable way to study the values system of an ancient through study of its mythology
- C 、without a thorough examination of a society on that society would be only partial cultural study on that society would be only partial
- D 、through the study of a culture’s mythological tradition, one can discern some of the underlying beliefs that shaped those stories
- 10 【阅读理解B】The efforts were not so successful with
- A 、poor countries
- B 、all the world
- C 、the Climate Adaptation Fund
- D 、the Global Fund to Fight AIDS, TB and Malaria
- E 、Bangladesh
- 、Malawi
- 、the U. S. and Europe
热门试题换一换
- A hush fell over the guests who had（）for the wedding celebration.
- 和上一个十年相比，近十年吸烟者中肺癌患者的比例下降了10%。据分析，这种结果有两个明显的原因：第一，近十年中高档品牌的香烟都带有过滤嘴，这有效地阻止了香烟中有害物质的吸入；第二，和上一个十年相比，近十年吸烟人数大约下降了10%。 以下哪项对上述分析的评价最为恰当（）。
- 以甲醇为燃料的汽车释放污染物，如一氧化碳和碳氢化合物，比以汽油为燃料的汽车释放的少得多。而甲醇燃料燃烧释放的甲醛却比汽油多。然而，一辆燃烧甲醇的汽车实际比与之相当的燃烧汽油的汽车产生更少的大气甲醛污染。因为：_____。 以下哪项如果正确，能最合乎逻辑地完成上文（）。
- 已知M是一个平面有限点集，则平面上存在到M中每个点距离相等的点。（） （1）M中只有三个点 （2）M中的任意三点都不共线
- 四个各不相等的整数a，b，c，d，它们的积abcd=9，那么a+b+c+d=（）。
- Inwhat way might people to Braintree think differently about paying taxes?（）
- Judging from the context, the phrase “wreaking havoc”(Para.2)most probably means（）.
- A Department of Health spokesperson proposedthat
- 曹、刘、孙三位老师对王霞和李明是否考上清华大学MBA分别做了如下预测： 曹老师：除非王霞考不上清华大学MBA，否则李明一定考上清华大学MBA。 刘老师：王霞和李明至少有一个考上清华大学MBA。 孙老师：只要李明考上清华大学MBA，则王霞考上清华大学MBA。 若三人的预测都为真，则以下哪项符合他们的预测（）。
亿题库—让考试变得更简单
已有600万用户下载
o2BMp