Choose the best topic sentence from the four options below. Writ

Choose the best topic sentence from the four options below. Write the corresponding letter of your choice in the blank provided. [A] Each of us inherits a culture made up，in part，of commonly accepted knowledge. [B] We may also learn that eating too much candy will decay our teeth. [C] We may learn from others that the earth revolves around the sun. [D] These are the things that everybody knows. Your choice: ________
【正确答案】：A
【题目解析】：段落的主题句对主题的限定主要是通过句中的关键词来表现的。关键词要尽量写得具体些。对“具体”的要求包括两个方面：一是要具体到能控制和限制段落的发展；二是要具体到能说明段落发展的方法。在考试中，我们主要使通过主题句的定义，主题句的位置，主题句中的必要要素和主题句与推展句的关系来判定哪一句是主题句，以及哪一句适合做主题句。而准确地把握关键词是清楚地表达段落主题、写好段落主题句的重要前提。本题中，B和C适合做以A为主题句的段落中的推展句。而D适合做这个段落的结论句。