【阅读理解。Thinkoflifeinadesert:nofoodorwateronlystrongsunandheavywindfullofsand.You'ddieofthirstwhilewaitingforapassingplanethatnevercomes.Butdon'tdismissthethoughtasanightmare(】

　　阅读理解。

　　Thinkoflifeinadesert:nofoodorwateronlystrongsunandheavywindfullofsand.You'ddieof

　　thirstwhilewaitingforapassingplanethatnevercomes.

　　Butdon'tdismissthethoughtasanightmare(噩梦).Yourhometowncouldbecomeadesertifnothing

　　isdonetopreventit.

　　Desertsareeatinglandathighspeed.InChinadesertification(沙漠化)hasaffected2622000square

　　kilometresequalto14GuangdongProvincesmostlyintheNorth.Desertsareadvancingatapaceof2460

　　kilometresperyear.

　　AccordingtotheUNone-thirdoftheplanet'slandsurfacewithonebillionpeoplehasbecomedesert.

　　AfricaAsiaandLatinAmericahavethedriestlandindangerofdesertification.

　　Recognizingthethreat(威胁)tohumanbeingstheUnitedNationshasnamed2006theInternational

　　YearofDesertsandDesertification.

　　Itwantstoincreasepublicawareness(关注)ofadvancingdeserts.Activitiesincludeafilmfestivalin

　　Romewithfilmsonlifeinunproductive(贫瘠的)lands.Meetingswilldiscussinternationalcooperationsuch

　　asplantingtreesandchangingagriculturalpractices.

　　Desertificationtakesplacewhererainislittleandtheclimatehot.Buthumanactivitiesarethebiggest

　　cause.Landturnsintodesertwhenthesoilisover-farmedandtoomanyanimalseatupplants.Tomake

　　moneypeoplealsocutdowntreesthatholdthesoil.Desertificationbringsseriousproblems.From1991to

　　2000droughts(干旱)killedover280000peopleworldwide.Whenlandbecomesuselessthere'sabigloss

　　infoodproduction.

　　Dustfromdesertsisblownintocitiesaroundtheworld.EachspringBeijingisatriskofyellowdust

　　fromtheGobiDesert.DustfromAfricareachescitiesintheUSandEuropeleadingtoillnessesand

　　worseningenvironments.

　　1.WhichofthefollowingisNotmentionedinthepassage?

　　[ ]

　　A.Thebadinfluencesofdeserts.

　　B.Howseriousdesertificationis.

　　C.Whatmakeslandturnintodesert.

　　D.Thewaystochangedesertsintofarms.

　　2.Thepurposeofwritingthefirstparagraphisto_______.

　　[