____paragraph is a group of sentences about some related subject. Readers must know what the main idea of ___paragaph is in order to understand ___information they are readingA.The ,a ,theB.A,the ,theC.A,a theD.The ,the ,the
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B解析考查冠词的用法。a/an表示泛指，而the表示特指。句意“一段话是有关某物的句子的意群。为了理解有效信息，读者必须先知道这段话的大意。”第一空是泛指，第二空和第三空是特指。故选B。