18、Human behavior is mostly a product of learning, ______ the behavior of animal depends mainly on instinct(本能).

A. whereas        B. so              C. unless            D. that

18、B

解析：turn“輪次、輪值”根據(jù)下句中的round“輪”而確定

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Human behavior is mostly a product of learning, ______ the behavior of animal depends mainly on instinct(本能).

A. whereas        B. so              C. unless            D. that

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