单项选择题

A．Samples of products.
B．Signs on shops.
C．Pictures of products painted on walls.
D．Free paper pamphlets.
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单项选择题
A．To demonstrate the importance of public health laws.B．To point out that without luck businesses will not succeed.C．To explain how traveling led to new inventions.D．To illustrate the importance of having the right product at the right time.
A．To demonstrate the importance of public health laws.
B．To point out that without luck businesses will not succeed.
C．To explain how traveling led to new inventions.
D．To illustrate the importance of having the right product at the right time.
填空题
S5. The neoclassical model is basically a model of the first stage, because at this stage the family could rely either on ___________.
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