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.
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S5. The neoclassical model is basically a model of the first stage, because at this stage the family could rely either on ___________.
单项选择题
A．They drank from public water fountains.B．They passed around a cup of water.C．They drank from personal tin cups that they earried with them.D．They bought a paper cup of water.
A．They drank from public water fountains.
B．They passed around a cup of water.
C．They drank from personal tin cups that they earried with them.
D．They bought a paper cup of water.
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