Unit2LookingintotheFuture选拔卷班级____________姓名_____________学号______________分数______________（考试时间：100分钟试卷满分：120分）注意事项:1.答卷前，考生务必将自己的姓名、准考证号填写在答题卡上。2.回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂黑。如需改动,用橡皮擦干净后，再选涂其他答案标号。回答非选择题时，将答案写在答题卡上，写在本试卷上无效。3.考试结束后，将本试卷和答题卡一并交回。第一部分阅读理解（共两节，满分50分）第一节供15小题；每小题2.5分，满分37.5分）阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。UnsolvedMysteriesAboutthePlanetEarthMystery1:Wheredidwatercomefrom?Watercoversmorethan70percentoftheEarth'ssurfaceandthatmakestheEarthearnthenickname"theblueplanet".Thenwherediwatercomefrom?ThemostpopularscientifictheorystatesthattheH2camefromseveralviolentasteroids。」、彳亍星）coveredwithice.AnothesuggeststhatthewateractuallyhasbeenaroundsincetheEarth'sformationHoweverithappened,though,it'scertainlyworkedoutwellfortheEarthlifeforms.Mystery2:Whataboutalltheoxygen?Anotherthingistheplanetsoxygen.Tinycreaturesreleasedoxygenasawasteproduct,fillingtheatmospherewithit.Afterthat,thelevelofoxygeintheEarth*satmospherewentwildlyupanddownuntilitfinallycalmedownaround540millionyearsago.Sincethen,it'sremainedataboutthebreathablelevelweknowtoday.Butwhatcausedittobesuddenlysteady?Mystery3:WhatcausedtheCambrian（寒武纪）Explosion?TheCambrianExplosionreferstotheexplosionofcomplexlifeformsthatoccurredonEarthabout540millionyearsago.Beforethen,lifehadconsistedmostlyofmicrobes.ButatthebeginningoftheCambrianperiodcomplexcreaturesbegandevelopingatarateneverseenbefore.Suddenly,lifeformshadbrains,eyes,andbones.MostlivingcreaturestodaycantracetheirbloodbacktotheCambrianperiod.Mystery4:Willwebeabletopredictearthquakes?Westillhaven'tbeenabletocomeupwithawaytoaccuratelypredictearthquakes.Wecancertainlytry,butourcurrenttechnologycannotpredictthemexactly.Weknowthatearthquakesstartwhentherockcracksundergroundandtheenormousenergyreleasedintheprocesscausesvibration,whichgeneratesearthquakewaves,butwehaven'tfiguredoutwhythathappens,orhowtopredictit.1.WhatwascreatedbycreaturesonEarth?A.Water.B.Bacterium.C.Oxygen.D.Ice.【答案】c【解析】细节理解题。根据Mystery2:Whataboutalltheoxygen?部分中的Tinycreaturesreleasedoxygenasawasteproduct可知，微生物把氧气当作废弃物释放出来。因此，氧气是地球上的微生物创造出来的。故选C项。2.WhichofthefollowingtalksabouttheEarth'sadvancedspecies?A,Mystery1.B.Mystery2.C.Mystery4.D.Mystery3.【答案】D【解析】细节理解题。根据Mystery3:WhatcausedtheCambrianExplosion?部分中的"Suddenly,lifeformshadbrains,eyes,andbones.”可知，突然之间，生物有了大脑、眼睛和骨头。因此，此部分内容介绍关于地球高级物种的信息。3.WhatdoweknowaboutMystery4?A.Itisamatterthathasextremelypracticalsignificance.B.Itwillbesolvedinthenearfuture.C.Itisthemostdifficultmysterytosolveofthefour.D.Itistheoldestmysteryofthefour.【答案】A【解析】推理判断题。根据Mystery4:Willwebeabletopredictearthquakes?部分的内容可知，能否准确预测地震与人类的生命和财产安全息息相关，极具现实意义，故选A项。Scientistssaytheyhavedevelopedasystemthatusesmachinelearningtopredictwhenandwherelightningwillstrike.Researchersreportthesystemisabletopredictlightningstrikesupto30minutesbeforetheyhappenwithina30-kilometreradius.Lightningisastrongburstofelectricityintheatmosphere.Sinceitcarriesextremelypowerfulelectri...