归纳段落大意，探索知识结构的内在联系。
Enable students to explore the inner relationship hidden in the knowledge framework.
第三，阅读每一段第一句话，找出段落大意；
Third, read the first sentence of each paragraph to find out the effect that paragraph;
高水平的作者会在段首用中心句说明段落大意。
Move your eyes quickly over each line and look for phrases and key words.
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