阅读理解
Inthe19thcenturyAmericansfromtheeasternstatesmovedoutwesttosettleintherichnewlandsalongthePacificCoast．Themostdifficultpartoftheirtripwascrossingthe“GreatAmericanDesert”inthewesternpartoftheUnitedStatesbyhorseandwagon．
Thewesterndesertcanbeverydangerous．Thereislittlewaterandtherearefewtrees．Butthedesertalsohassceneryofgreatbeauty．Talltowersofredandyellowstonerisesharplyfromtheflatsandyvalleyfloor．ThescenehasbeenphotographedmanytimesandappearsinmoviesandonTV．
InArizonaman-madedamsacrosstheColoradoRiverhavemadetwolargelakesinthemiddleofthedrydesertcountry．AtLakePowelltheredstonearchofRainbowbridgeriseshighabovethebluelake．
Therearefewroads．ManyareasofLakePowell'sshorecanonlybereachedbyboatoronfoot．ButhikersinthisemptydesertlandsometimesfindveryoldnativeAmericanpicturespaintedontherocks．
InDeathValleyCaliforniathesummertemperaturerisesto130－165degreesFahrenheit．Thereislessthantwoinchesofraineachyear．DeathValleyisthelowestplaceinAmerica－925metresbelowsealevel．Inthe1800smanytravelersdiedwhentheytriedtocrossthiswaterlessvalleyintheterribleheat．
Althoughthedesertisdryandseemsemptythereisplentyoflifeifyoulookclosely．Smallinsectssnakesandratshavelearnedhowtoliveinthedesertheat．Theyliveundergroundandcomeoutatnightwhenitiscool．Plantssuchascactineedverylittlewater．Whenitdoesraininthedesert(sometimesonlyonceortwiceayear)plantsgrowquicklyandflowersopeninasingleday．Forashorttimethedesertiscoveredwithsplendidcolor．
(1)
A．
enjoyedthetrip
B．
wantedtomaketheirhomethere