题目内容

Research shows that humans ______ from selfish to unselfish behavior when they are watched.
A．tellB．switchC．rangeD．distinguish
B

试题分析：A. tell辨别，B. switch转换，C. range在…范围变化，D. distinguish区别，句意：研究表明人类当被注视的时候，会从自私的行为转变成无私的行为。所以选B。
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