It is k___ to all that "sudan I"("苏丹红1号") does harm to our health

It is k___ to all that "sudan I"("苏丹红1号") does harm to our health

题目

It is k___ to all that "sudan I"("苏丹红1号") does harm to our health

答案

It is known to all that "sudan I"("苏丹红1号") does harm to our health

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