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.
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假设你在某日某时某地目击一起火灾，就此写一份见证书。见证书必须包括以下几点：1．火灾发生的地点2．你所见到的火灾场面3．对火灾原因的分析 An Eye-Witness Account of a Fire
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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 ___________.
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