The outer solar system

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1、托福模拟测试2014年2月21日阅读第1篇Paragraph11.Thewordinnumerableinthepassageisclosestinmeaningto_______.A.variedB.indisputableC.individualD.Countless2.Theauthor’sdescriptionoftheoutersolarsysteminparagraph1mentionsallofthefollowingEXCEPT:A.Theeffectofthesun’sgravityonitisminimal.B.Itexistsbe

2、yondtheorbitsoftheeightplanets.C.Itcontainsagreatnumberofsmallfrozenobjects.D.Dwarfplanetsandtheirmoonsarelocatedthere.Paragraph2:3.Accordingtoparagraph2,whichofthefollowingistrueoftheKuiperBelt?A.Someoftheplanetstravelthroughitastheyorbitthesun.B.Therearemanyobjectswithinitthat

3、revolvearoundthesun.C.Itextendsallthewayouttosixty-eightAUTheOuterSolarSystemParagraph1Theinnersolarsystemconsistsofthesun,eightplanets,theirmoons,andthecountlessothercelestialbodiesthatorbitthesunbetweentheplanets.Therearealsoinnumerableobjectsintherealmbeyondthelastplanetinthe

4、regionthathasbeentermedtheoutersolarsystem.Theseobjectsincludeseveraldwarfplanetsandtheirmoons,comets,andvarioussmallcityandrockyobjectsthataretoosmalltobeclassifiedaseither.Paragraph2Theboundaryofthesolarsysteminthelimitofthesun’sgravitationalpullsinceanyobjectsthatgetcaughtbyi

5、tsgravitywillbegintoorbitthesun.Sofar,themostdistantobjectdiscoveredthatorbitsthesunisapproximatelysixty-eightastronomicalunits(AU)fromthesun,yetsomeastronomersbelievethatthesun’spullmayextendevenfurtherthanthat.OneAUisequivalenttothedistanceofEarthfromthesun---roughly150million

6、kilometers.AstronomersrefertotheregionofspacewherethemajorityofthesefarawayobjectsorbitthesunastheKuiperBelt.Paragraph3ThemostdistantvisibleobjectthatisstillapartofthesolarsystemisEris,thelargestdwarfplanet,whichissixty-threeAUfromthesun.Itissofarfromthesunthatitcompletesa第7页共4页

7、托福模拟测试2014年2月21日阅读第1篇fromthesun.D.Itcoversanareaspanningapproximately150millionkilometers.Paragraph3:2.WhydoestheauthormentionEris?A.Tostatethatitisoneofthefivedwarfplanetsinthesolarsystem.B.Toclaimthatnothingelsevisibleinthesolarsystemisfartherfromthesun.C.Tocompareitscharacter

8、isticswiththoseoftheknowndwarfplanets.D.Toempha