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段落的主題句對主題的限定主要是通過句中的關(guān)鍵詞來實現(xiàn)的。也就是說,中心思想中應包含著一個相對具體的關(guān)鍵詞(用下劃線標出)。對 “具體” 的要求包括兩個方面:一是要具體到能控制和限制段落的發(fā)展;二是要具體到能說明段落的展開方法。Exercise BThere is something wrong with the following topic sentences, please rewrite them to make them effective.請找出下面4個主題句存在的問題并進行修改。1. My hometown is famous because it is located by Wheaton River, which is very wide, and because it is built near an unusually steep hill called Wheaton Hill. 2. Stephen Hawking39。s physical di