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money,theywillhavenoworries.However,mostpeopleneverfeeltheyhaveearnedenough.JasonHarleydecided16(drop)outofthiskindoflifestyle,andhediscoveredthat17(have)onlyalittlemoneymadehimfree.Arethereanythingshemissesfromhispast?"No,I'mmuchhappiernow,becauseIamlivingaccordingtomyvalues.Success18(measure)notbyhowmuchmoneyyouhavebutbyhowyouunderstandthetruemeaningoflife."BSeveralmassextinctioneventshaveoccurredinthecourseofourplanet'shistory.Scientistssaythatpreviouslythe19(reason)forextinctionhavevaried,buthumanactionswillbetoblameforthesixthextinctionwhichhasalreadystartedtohappen.ItisclearthathumanactivitynegativelyaffectsalmosteverynaturalthingonEarthfromdestroyingdifferentspeciesofplantsandanimals20creatingvarioustypesofgreenhousegases.Infact,speciesarebeingwipedoutata21(fast)ratenowthananytimeinhistory.CIntheearlydaysofspacetravel,scientists22(send)animalsintospacetolearnabouttheconditionshumansmightface.Bystudyinganimals,theywereabletounderstand23itwasliketolivewithoutEarth'sgravityandatmosphere.Theanimalswereusedtotestspecially24(design)equipmentthatwouldlaterbeusedforhumanspaceflight.Animals25survivedaspaceflightprovidedinformationabouthowweightlessnesswouldaffecthumans,whatspaceshipdesignswouldbethesafest,andhowwellaspacesuitwouldwork.第II部分阅读理解(40分)阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑
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