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【单选题】
(课文理解)Trading a cow for a buffalo, jointly using the village water well, Egyptian homes built around a common courtyard where women gathered to dry spices and children gathered to play — all are examples of shared resources in ancient cultures. What kind of economic model did the examples show?
A.
Market economy
B.
Barter economy
C.
Planned economy
D.
Collaborative economy
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【单选题】Now that she is out of work, Lucy going back to school, but she hasn't decided yet. [     ]
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B.
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存在凹贝纹痕迹的一侧为非受力面。
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