水是人类宝贵的自然资源．下列关于水的说法中，正确的是（　　）

如图所示，已知∠B=∠C，AD∥BC，试说明：AD平分∠CAE．

     Mr. Jackson is a teacher of science in a middle school. His students like his classes because his classes are very interesting. They can learn a lot in his class. The students can make（制作）many things. His little son Val also likes making things. He makes lots of machines（机器）, such as a machine like a man. It can do the job that is dangerous（危险的）for people to do. He says, “I want to be a scientist.”
根据短文内容，选择正确答案。

如图，△ABC中，AB=5，AC=6，BC=4，边AB的垂直平分线交AC于点D，则△BDC的周长是（　　）