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参考答案:

B

习语搭配。on a…note以一种……的调子，带上一种……口气：We have opened our discussion on a friendly and constructive note．我们在友好和建设性的气氛中开始讨论。on the nod无异议地，无反对地：The chairman's proposals are usually passed on the nod at the shareholders' meetings．在股东会上主席的提议通常在无人反对的情况下一致通过。