知识与技能 (1) 理解一点分一条有向线段所成比的定义及的范围, (2) 熟记定比分点坐标公式和中点坐标公式, (3) 熟练运用定比分点坐标公式和中点坐标公式解决相应问题.
3. 词数:100左右。 [参考范文]Wenchuan EarthquakeAt 2:38 on May 12th,2008, a big earthquake took place in Wenchuan, Sichuan. It was one of the strongestearth
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