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单项选择题

阿司匹林加碳酸钠试液加热后，再加稀硫酸酸化，此时产生的臭气对应的产物是

A．苯酚
B．乙酰水杨酸
C．水杨酸
D．醋酸钠
E．醋酸
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下列（）不属于需求开发活动。
A、需求获取 
B、需求分析 
C、需求验证 
D、需求管理
不定项选择
欧共体是由欧洲煤钢共同体、欧洲经济共同体和欧洲原子能共同体合并而成的。
A．正确
B．错误
单项选择题
Consider the price and demand for flower vases. The price of cut flowers goes up sharply. Which of the following would you expect to happen?
A．The demand curve for flower vases will shift to the left and their price will rise B
B．The demand curve for flower vases will shift to the right and their price will rise
C．There will be a movement along the demand curve for flower vases and their price will go down
D．The demand curve for flower vases will shift to the left and their price will go down
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