Human behavior is mostly a product of learning, ______the behavior of animals depends mainly on instinct.

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问题 Human behavior is mostly a product of learning, ______the behavior of animals depends mainly on instinct.

选项 A、whereas
B、so
C、unless
D、that

答案A

解析 句意:人类的行为是学习的结果,而动物的行为主要依靠本能。前后两句有转折对比之意。whereas表转折“然而,但是”。so表因果,“因此,所以”。unless表条件,“除非”,that引导名词从句。故选A。
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