【WhenOaklandHighSchoolinCaliforniamovedintoanewbuilding．thestudentsandteachersnoticedastrongsmell．Thenalmosthalfofthestudentsbegantohaveaheadacheandacough．Experts(专家)cametofindthecauseofthes】

WhenOaklandHighSchoolinCaliforniamovedintoanewbuilding．thestudentsandteachersnoticedastrongsmell．Thenalmosthalfofthestudentsbegantohaveaheadacheandacough．Experts(专家)cametofindthecauseofthesickness．Finally，theydiscoveredthattheairinthebuildingwasnotsafetobreathe．Theyweresurprisedtofindoutthatthedesksandchairsintheschoollibrarycausedthetrouble．Thesedesksandchairsweremadeofparticleboards(合成板)．Thiskindofboardischeap．Itismadeofverysmallpiecesofwoodheldtogetherwithachemical(化学物质)．Thisisjustoneexampleofamodemproblemthatismostcommonincities—indoorairpollution(污染)．

Peoplehaveworriedaboutairpollutionformanyyears，andthegovernmenthasspentlotsofmoneytryingtocleanuptheairofbigcities．Butnowwefoundthatwearestillbreathingunhealthyair．Astudyshows：Indoorairpollutionisalmosttwotofivetimes(倍)worsethanoutsidepollution．Soremembertoopenthewindowsanddon’tstaytoolonginmodernbuildingswithwindowsclosed．

( )51．Manystudentsandteachers________aftertheymovedintothenewbuilding．

A.wereveryhappyandexcited B.didn’tfeelwell C．felttiredbecauseofhardwork

( )52．TheexpertscametoOaklandHighSchoolfor________．

A．stayingwiththesickstudentsandteachers B．takingawaythedesksandchairs

C．findingthecauseoftheillness

( )53．WhichofthefollowingisNOTtrueaccordingtothepassage?

A．Theindoorairpollutioniscommonincities．

B．Weneedn’tworryabouttheoutsidepollution．

C．Theairinthisschoollibrarywasnotsafetobreathe．

( )54．Astudyshowsthatindoorairpollutionis________．

A.evenworsethantheoutsidepollution B．notsobadasoutsidepollution

C．theonlyproblemtoworryabout

( )55．What’sthemainideaofthepassage?

A.Nevermoveintoanewbuilding． B.Weshouldn’tbuycheapdesksandchairs．

C．Theindoorairpollutionisabigandcommonproblem．