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

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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