PaulSalopekisanold-fashionedexplorersettingoutonfoottocircletheworld.Heisalsoamodern-dayexplorer.Ontopofafewclothesasmallfirst-aidkitandnotebooksheiscarryingarecorderavideocameraasmallcomputerandasatellitephone—atelephonethatconnectstoasatelliteandcanbeusedinmanyplaceswherecell-phonesdon’twork.

Thejourneyislong21000miles!Itwilltakesevenyearstocompleteit.

SalopekwasborninCaliforniaandspenthischildhoodinMexico.Hesayshehasalwayslikedtotravelanddoesn’tliketorush.AttheageoffourteenheclimbedMoun.WhitneyinCaliforniaandcrossedthestate’sSierraNevadaMountainsalone.WhenhewasfifteenyearshewalkedthelengthofDeathValley.Heoncerodeamule2000milesthroughmountainsinMexico.

AlongtimereporterSalopekhasreportedfromAfricaAsiaandMexico.Now51yearsoldheplanstokeepwriting.Ashetravelsaroundtheworldheiswritingstoriesaboutthepeoplehemeetsandthewaytheylive.Helooksforhowpeoplefindlocalsolutionstobigproblemssuchaslackoffoodandwater.HealsorecordsthesoundshehearsandtakesphotosoftheskyandtheEarth’ssurface.

ThelongwalkstartedintheRifeValleyinEthiopiainEastAfrica.ManyconsiderEastAfricatobehometothefirsthumanswholived160000yearsago.

SalopekisretracingthepathsourancestorstookastheyleftAfricaandsettledinpartsoftheMiddleEastEuropeAsiaandtheAmericas.AsSalopekiswalkingheislearningmoreabouthimselfandallofhumankind.

1.Theunderlinedphrase“ontopof”inthefirstparagraphcanbereplacedby____.

A.inadditiontoB.inthelightof

C.inreferencetoD.intheserviceof

2.Theauthordevelopsthethirdparagraphmainlyby____.

A.providingexamples

B.makingcomparisons

C.makingacarefulanalysis

D.followingtheorderoftime

3.AccordingtothepassagePaulSalopekisa____.

A.doctorwholikescarryingthesmallfirst-aidkit

B.writerwholikestravelingexploringandstudying

C.journalistwholikestravelingexploringwritingandstudying

D.photographerwhoisgoodatusingsatellitecommunicationequipment

4.What’