Anthropologists usually study simple, unindustrialized societies because the number of______is limited.

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问题 Anthropologists usually study simple, unindustrialized societies because the number of______is limited.

选项 A、vehicles
B、variables
C、varieties
D、systems

答案B

解析 variables 意为“变量，变项”。[A]vehicles意为“陆上交通工具，车辆”；C.varieties意为“多变性，多样性”；[D]systems 意为“系统”。

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