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段落的主題句對(duì)主題的限定主要是通過(guò)句中的關(guān)鍵詞來(lái)實(shí)現(xiàn)的。也就是說(shuō),中心思想中應(yīng)包含著一個(gè)相對(duì)具體的關(guān)鍵詞(用下劃線標(biāo)出)。對(duì) “具體” 的要求包括兩個(gè)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(shuō)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(qǐng)找出下面4個(gè)主題句存在的問(wèn)題并進(jìn)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