阅读理解. Imaginereadingonedaythatyouhadbeenasubjectinariskyscienceexperimentwithoutknowingit.
Atschool,youhadbeenfedcereallacedwithradioactivechemicalssoscientistscouldlearnmoreabout
thedigestivesystem.Becausethefoodwasradioactive,scientistscouldeasilytraceitspaththroughthe
body.
Scientistsnowknowthatexposuretolargeamountsofradiationcancausecancer,agroupofdiseases
inwhichbodilycellsgrowwildlyoutofcontrol.Somepeoplewhowerepartoftheradiationstudieslater
developedcancerandblametheradiationforcausingthecancer.Othersareworriedtheradiationwill
somedaymakethemsick.
Somedoctorssaythat,inmanycases,suchfearsareunjustifiedbecausetheradiationdoses(剂量)used
intheexperimentsweretoosmalltocauseharm.Theyalsosaythatsincethedangersofradiationwereless
wellunderstoodthenthantheyarenow,evenresearcherswhousedhighdosesofradiationdidn'tdoanything
wrong.
Somecriticsclaimthatnoexcuseisacceptablefornotinformingsubjectsaboutthenatureofanexperiment
andgivingthemachancetorefusetoparticipate.Today,governmentrulesrequiresuchinformedagreement
wheneverastudyusespeople.1.Thepassageismainlyabout_____.A.whatkindsofexperimentcannotbedoneonpeople
B.whetheritismoraltoexperimentonpeoplewithouttellingthem
C.whatresultcanbeobtainedinaradioactiveexperiment
D.howradiationstudiesareconducted2.WhichofthefollowingstatementsisTRUEaccordingtothepassage?A.Humancellscanbeexcitedbytheradiationtogrowwildlyoutofcontrol.
B.Aslongasthedangerofradiationhasnotbeenproved,highdosesofitcanalsobeacceptable.
C.Mostcancersarecausedbyradiation.
D.Anyexposuretoradiationwillsurelycausecancer.3.Thegovernmentrulesdemand_____.A.tostopallexperimentsharmfultopeople
B.toprohibitalltheexperimentsonhumans
C.tolicenceallthetestsrelatedtohumanbeings
D.toprotect