It is in their ability to speak ______ humans ______ from animals. 
A．which; differB．that; different
C．that;differD．which;different
C

第一空考查的是強調(diào)句，第二空考查動詞differ from“于…不同”，句意是：人類和動物的不同在于他們說話的能力。選C。
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