NationalParksarelargeareasofpublicland.Theygiveasafehomeforlocalplantsandanimals.Theyhelpkeeptheairandwaterclean.Theyalsogiveusthebesttrips.Todaytherearenearly7000nationalparksaroundtheworld.Forbeshaslisted12ofthemostbeautifulonesintheworldthatwillsurpriseyouwiththeiramazinglandscapesgeo?graphicwondersandcolourfulplantsandanimals.
TheGrandCanyon(大峡谷)NationalParkoftheUSisoneoftheSevenNaturalWondursoftheWorld.Itisbestknownforitssizeanddepth.Itis446kilometreslongupto29kilometreswideand1.6kilometresdeep.Theimmensityofthecanyonmakespeoplethinkbig.Everyyearabout5millionpeoplevisithere.TakingatourintheSouthRimoffersvisitorsthepark'sfullviewswhiletheNorthRimshowsbeautifulwildflowers.
Ifyouloveanimalsyou'llliketheSerengetiNationalParkinTanzania.The"BigFive"livethere.TheyarethelionAfricanelephantAfricanleopardblackrhinocerosandAfricanbuffalo.Thename"BigFive"camefromthefiveanimalsthatwerethehardesttocatch.Nowtheyarewhatpeoplemostwanttoseeinthewild.Ifyouvisittheparkyoushouldnevermissthemigration(迁徙)ofover1.5millionwildebeests(角马)and250000zebraseveryyear.Thisisthemostfamoussiteofthepark.
( )21.WhichisNOTrightaboutnationalparksaccordingtoParagraph1?
A.Anationalparkispubliclandthatcoversalargearea.
B.Wildplantsandanimalsareprotec?tedinnationalparks.
C.Forbes has listed twelve oftheworld'slargestnationalparks.
D.Nationalparksareattractivebecauseoftheirnaturalbeauty.
( )22. Theunderlinedword"immensity"refersto .
A.greatsize
B.naturalwonder
C.colourfulview
D.unusualbeauty
( )23. kindsofanimalsarementioned inthepassage.
A.Five B.Six C.Seven D.Eight
( )24. Thebesttitleforthepassagemaybe
A.TakingatourintheGrandCanyon
B.TravelingtotheSerengetiNationalPark
C.SevenNaturalWondersoftheWorld
D.Steppingintothewondersofthewildlife
( )25. Ifthewritercontinu