It is in their ability to speak ________ humans ________ from animals.
A．which；differB．that；differentC．which；differentD．that；differ
D
考查強調(diào)句型和固定詞組。強調(diào)句型：it is/was被強調(diào)成分that/who其它成分。強調(diào)句型最大的特點是把it is/was…that/who…去掉，句中仍然是對的。本題第一空正是強調(diào)句型，強調(diào)的是in their ability to speak，第二空是固定詞組differ from…與…不同。句意;正是在說話的能力父母，人們區(qū)別與動物。故D正確。
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