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

試題分析：A. tell辨別，B. switch轉(zhuǎn)換，C. range在…范圍變化，D. distinguish區(qū)別，句意：研究表明人類當被注視的時候，會從自私的行為轉(zhuǎn)變成無私的行為。所以選B。
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