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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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