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【单选题】
以下是土壤污染的特点，除外A.
土壤污染物主要通过与人的直接接触而影响人体健康
B.
土壤污染物以间接影响人体为主，主要途径是土→植物→人，或土→水→人
C.
土壤污染的来源很复杂，有来自空气、水、废渣、垃圾等
D.
土壤污染物的性质很多样化，有化学性污染、物理性污染、生物性污染等
E.
土壤受重金属和农药的污染后，很难消除，污染期很长
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