孟德尔对遗传定律的探索经过了( )
A:分析→假设→实验→验证
B:假设→实验→结论→验证
C:实验→假设→验证→结论
D:实验→分析→假设→结论
The movie covers all of Chinese history. It is _______ worth seeing again.
如图,AD平分∠BAC,AB=AC,连接BD,CD并延长交AC,AB于E,F点,则此图中全等三角形共有( )