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例1: The speaker who does not have specific words in his working vocabulary may be ____to explain or describe in a way that can be understood by his listeners.

A obscure B difficult C impossible D unable

分析：首先，看选项，四个选项的单词都是一些基础词汇，所以选项词汇不是解题的难点。其次，浏览题干，题干中也都是简单词汇，所以这道题然不是考查大家的词汇知识。那就涉及到语法层面的考查了，通过浏览题干，我们会被who，that这样的连词吸引，这样的连词是引导从句的，而从句在句子中属于修饰成分，那通过语法知识，我们需要把who does not have specific words in his working vocabulary和that can be understood by his listeners这两个修饰成分拿掉，这样剩下的就为句子的主干结构The speaker may be ____to explain or describe in a way，很显然，这里让大家选择一个能够用来修饰主语the speaker的形容词，结合四个选项的词意，故本题选D。