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【单选题】
刚性需求是指商品供求关系中受价格影响较小的需求，即需求弹性较小的需求。弹性需求是指当产品或服务的价格有所变动时，市场对该产品或服务的需求也发生明显变动的状况。 根据上述定义，下列情况中未涉及刚性需求的是：A.
某图书因为是资格考试指定教材，即使从不打折，购买者依然众多
B.
非典期间，不少民众哄抢板蓝根导致板蓝根价格上升，但其销售量并未因此下降
C.
双十一当天淘宝天猫的交易额达350．19亿元，仅仅一小时，就卖出200万件内衣
D.
受金融危机影响，汽车产业表现低迷，但粮食等生活必需品的销量并未受到太大影响
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【简答题】What is the soul of a good speech?
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A.
正确
B.
错误
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