题目

I was walking in the park with a friend recently, and his cell phone rang, interrupting our conversation. There we were, walking and talking on a beautiful sunny day. But I became in visible, absent from the conversation.  The telephone used to connect you to the absent. Now it makes people sitting next to you feel absent. Recently I was in a car with three friends. The driver told us to be quiet because he could not hear the person on the other end of his cell phone. There we were, four friends going down the highway, unable to talk to one another because of a tool designed to make communica如图，已知AB∥CD，F为CD上一点，∠EFD=60°，∠AEC=2∠CEF，若6°＜∠BAE＜15°，∠C的度数为整数，则∠C的度数为_____．