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【单选题】
选出对慢性毒性的正确表述( )A.
农药一次经口或皮肤或呼吸道进入动物体内,迅速表现中毒症状的毒性。
B.
试验时间6个月,症状主要表现为“三致”,即致畸、致癌和致突变。
C.
在3个月以上时间内经常接触、吸入或食物带有农药,最后导致人、畜发生与急性中毒类似的症状。
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