简答题 英译汉：She purchased materials of￥7000 on account.

Which of the following does Article 2A of the Uniform.Commercial Code govern？（）

A.mixed sales
B.sale of goods
C.leases
D.letters of credit

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Which of the following must a promissory note contain to make it negotiable？（）

A.an acknowledgement of debt
B.an implied promise to pay
C.an unconditional promise to pay
D.a promise to negotiate

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