2. 外语
  3. Anthropologists usually study simple, unindustrialized societies because the number of ______ is limited.

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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