Everyday，peoplecomeintocontactwiththousandsofchemicals．Thesechemicalsaresaidtobeharmlesstohumanhealth．Infact，thechemicalsareconsideredsosafethatwewashwiththem．Weputthemonourbodiesandevenourfaces．Other
Everyday，peoplecomeintocontactwiththousandsofchemicals．Thesechemicalsaresaidtobeharmlesstohumanhealth．Infact，thechemicalsareconsideredsosafethatwewashwiththem．Weputthemonourbodiesandevenourfaces．Otherchemicalproductsareusedthroughoutourhomes．
Bythetimeyouwalkoutofyourfrontdoor，youhavealreadybeenexposedtothousandsofchemicals．
Onitsown，eachchemicalseemsharmless．Butincombinationwithotherchemicals，theymaybecomedeadly．Thatisthefindingofatwo-yearstudybyahigh-profile（高调的）taskforceofscientists．Thetaskforcewastoldtoinvestigatethecancer-causingpossibilityofchemicalmixtures．
LindaGulliverwasoneofthe174scientistsonthetaskforce．Theirjobwastostudythecancer-causingpotentialof85chemicals．All85aresaidtobecommonintheenvironment．
Ms．Gulliverexplainsthatchemicalshavethepotentialorabilitytoformdangerousmixtures．Evensimplemineralscanbecomedangerouswhenmixedwithchemicalsfoundinplasticsorbeautyproducts．
Workingingroups，thescientistsexploredhowdifferentchemicalmixturescouldleadtocancer．Ms．Gulliver'steamlookedattheabilityofdifferentcombinationstosupporttheincreaseofmalignant（恶性的）humancells．
Shesaysthecurrentwaytoidentifywhetherchemicalscausecanceristotestthemoneatatime．Thismethodleads，sheadds，toalonglistofsupposedly"safe"chemicals．Sheandherteamsaythatapproachneedstochange．
"Wedefinitelyneedcertainresearch…tofindoutwhatmixturesofchemicalswouldbemoreharmfulthanothers；whatgroupsofchemicals，whentogether，wouldproducemoreharmfuleffects．Andatthemoment，thatisnotknown．"
Anestimatedoneinfivecancershasbeenlinkedtochemicalexposure．Itmayturnoutthatthecancer-causingvillain（恶棍）isnotasinglechemicalatall．
32．Whateffectmayonesinglechemicalhaveonusaccordingtothetext？___
A．Itmaydestroyourbody．
B．Itmaynotcausedangertous．
C．Itmayletussufferfromcancer．
D．Itmayletourbodymakeachange．
33．WhatcanwelearnaboutMs．Gulliver'sresearch？___
A．Shehasfound85cancer-causin
