ssat_考试模拟阅读题

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1、SSAT例题阅读Directions:Readeachpassagecarefullyandthenanswerthequestionsaboutit.Foreachquestion,decideonthebasisofthepassagewhichoneofthechoicesbestanswersthequestions・RadiationfromtheSuncontinuouslybreakstwo-atomoxygenmoleculesintosingleatoms・Someoftheselinku

2、pwithordinaryoxygenmoleculesandformozone・Somerejoinotherfreesinglesandreverttostablemolecules・ThisSun-energyprocess,ifleftundisturbed,maintainsafairlyconstantsupplyofozoneabovetheEarth?ssurface・Theozonelayerbeginsabouteightmilesupandisdistributedthinlytoab

3、outthirtymilesup.ThisloftyumbrellaofozoneshieldstheEarthfrommuchoftheSun'sdeadlyultravioletrays・Withouttheozonecover,lifeonEarthwou1dbe1iteral1ysunburnedtodeath.Somescientistsbelievethatrelativelysmallamountofsyntheticchemicals,suchasspray-canfluorocarbono

4、rjetexhaust,reachtheupperlimitsoftheatmosphereandbreakdownthethree-atomozonemolecules・Itisalsobelievedthatjustoneatomofthespray-canorgetpollutantcanaffectvastnumbersofozonemolecules・Weatherresearchsatel1iteshaveobservedtheozoneshieldingreatdetail,buttheird

5、atahaveneitherputtoresttheadoomsdaytheories"norincitedaglobalcampaigntostopdestroyingtheEarth?sprotectivecovering・1.Accordingtothepassage,ozoneisa(A)kindofradiation(B)deadlyultravioletray(C)combinationofoxygenatoms(D)syntheticchemical(E)free-floatingatom2.

6、ThedestruetionoftheozonelayerwouldmostlikelyresuItinadecreasein(A)lifeonEarth(B)airpollution(C)spray-cangases(D)severecasesofsunburn(E)radiationfromtheSunInthesixteenthcentury,anageofgreatmarineandterrestrialexploration,FerdinandMagellanledthefirstexpediti

7、ontosailaroundtheworld.AsayoungPortuguesenoble,heservedthekingofPortugal,buthebecameinvolvedinthequagmireofpoliticalintrigueatcourtandlosttheking'sfavor・AfterhewasdismissedfromservicetothekingofPortugal,heofferedtoservethefutureEmperorCharlesVofSpain.Apapa

8、ldecreeof1493hadassignedalllandintheNewWorldwestof50degreesWlongitudetoSpainandallthelandeastofthatlinetoPortuga1.MagellanofferedtoprovethattheEastIndiesfellunderSpanishauthority・OnSeptember20,1519,Magellanse