今日听力：草本植物药和癌症音频听力文本Forthousandsofyearsthearistolochiaplantwithitsreddish-yellowflowershasbeenamainstayofChineseherbalmedicine.SometimesreferredtoasbirthwortinEurope,thetoxicnatureoftheplantwasdiscoveredintheswhendozensofBelgianwomenbegandevelopingkidneyfailureandurinarytractcancers.Theydbeenusingaristolochia-basedslimmingaidsatclinic.Nowscientistssaythatthekeyelementoftheplant,aristolochicacid,isresponsiblefortheveryhighlevelsofkidneydiseaseandurinarytracttumoursinTaiwan.Itsestimatedthataboutoneinthreeofthepopulationtherehaveusedherbalmedicinescontainingthetoxin.Thecountryhastheworldshighestincidenceofcancersoftheupperurinarytract,andintheirstudythescientistssaymorethanhalfcanbedirectlylinkedtotheingredient.Whileproductscontainingaristolochicacidarebannedinmanycountries,oneofthebigconcernsisChina.InastudysuggeststhatChinesefarmersproduceenoughoftheplanttodosemillionpeople.Scientistsareconcernedthatinthedecadesto
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