题目内容：
WhichofthefollowingstatementsisNOTtrue? A．Drugsarealwaysgiventoanimalsformedicalreasons.
B．Someoftheadditivesinourfoodareaddedtothefooditselfandsomearegiventothelivinganimals.
C．Researchershaveknownaboutthepotentialdangersoffoodadditivesforaboutseventyyears.
D．Foodmaycausefortypercentofcancerintheworld.
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答案解析：