题目

判断题。(T or F)1. How can we do? ( )2. I’ll miss her. ( )3. Why don’t take some photos? ( )4. Good idea. ( )5. We can put our names on the book. ( ) 答案：【答案】1-5 FTFTF【解析】略16、“三角形的三条中线交于一点，且这一点到顶点的距离等于它到对边中点距离的2倍”试类比：四面体的四条中线（顶点到对面三角形重心的连线段）交于一点，且这一点到顶点的距离等于它到对面重心距离的3倍．