皮皮学，免费搜题
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【单选题】
黑脚病是哪种重金属中毒?A.
汞
B.
镉
C.
砷
D.
铬
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A.
Insurance company clerk and customer.
B.
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C.
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D.
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【单选题】I want to buy some stamps. Can you tell me ______near here?
A.
is there a post office
B.
where is the post office
C.
if there is a post office
D.
whether is there a post office.
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