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1、第一部分模拟试题全国专业技术人员英语等级考试A级试题第2部分：阅读判断（第16~22题，每题1分，共7分）阅读下面这篇短文，短文后列出了7个句子，请根据短文的内容对每个句子做出判断。GoodorBad?Saccharin(糖精)istheonlytrulyman-madesweetener.Itwasdiscoveredbyaccident100yearsagoinanexperimentwithcoaltar(煤焦油).Intheexperiment,ascientistgotsomesubstance(whichlaterheknewwassaccharin)onhisfin
2、ger.“Later,atdinner,heputhisfingerintohismouthandnoticedthesweettaste,”saysEricWalters,professorofbiochemistryattheChicagoMedicalSchool.Containingnocalories,saccharinisnotabsorbedbythehumanbody.Itbegantobedislikedbypeopleduringthelate1970sandearly1980swhenonesetofstudiesshowedthatitcausedcanc
3、erinlaboratoryanimals.AccordingtoWalters,itisnotfairtosaccharinbecausethestudieswerenotperfect.Morerecenttestingwithotheranimalswithsmallamountsofsaccharinhasnotrepeatedthesameresults.Evenwiththeseexperimentalresults,saccharinlabelsarestillrequiredtocarryawarningsayingithasbeenshowntocausecan
4、cerinlaboratoryanimals.In1990,saccharinwasallowedtobesoldinthemarketagain.Becauseitishundredsoftimessweeterthantablesugar,onlyasmallamountofsaccharinisusedathome,inrestaurantsorinthefood-makingindustry.Anothersweetenerwecommonlyuseisaspartame(甜味剂).Itisnotsosweetassaccharin,butmuchsweeterthant
5、ablesugar.Unlikesaccharin,however,aspartamecanbeabsorbedintothebody.Itcontains4caloriespergram,thesameastablesugar.Butaspartameis180timessweeterthansugar.Althoughaspartameisfoundinthousandsofproducts,itssafety,likesaccharin,hasstillbeenuncertain.Nevertheless,peopleallowitsuseinallfoodsanddrin
6、ks.“Inmyopinion,aspartameisassafeassugar—butthentherearethosewhothinkwhitesugarisdangerous,”saysWalters.“Betweenaspartameandsaccharin,Iwouldpickaspartame.Butatnormaluselevels,Ithinksaccharinissafetoo.”16Whentalkingaboutsaccharinandaspartame,EricWaltersmostprobablythinksthataspartameissafertha
7、nsaccharin.ARightBWrongCNotmentioned17Afterdoingmanyexperiments,Waltersfinallyfoundsaccharinatdinner.ARightBWrongCNotmentioned18Aspartameissweeterthansaccharinwheninhotdrinks.ARightBWrongCNotmentioned19Becausesaccharinwasreportedtohavecausedc
