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单项选择题

以下对总需求曲线表述正确的是()。

A.曲线向右下方倾斜，表示在其他条件不变的情况下，物价总水平与商品和劳务的总需求呈负相关关系
B.曲线向左下方倾斜，表示在其他条件不变的情况下，物价总水平与商品和劳务的总需求呈正相关关系
C.曲线向右下方倾斜，表示在其他条件不变的情况下，物价总水平与商品和劳务的总需求呈正相关关系
D.曲线向左下方倾斜，表示在其他条件不变的情况下，物价总水平与商品和劳务的总需求呈负相关关系
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