单项选择题
A.5% B.15% C.6% D.16%
A.5%~18% B.7%~20% C.10%~25% D.15%~25%
A.牛肉 B.蛋黄 C.海带 D.黑木耳
A.肠癌 B.肝癌 C.胃癌 D.食道癌
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