法律对社会各方面所起的作用是（    ）

如图，在▱ABCD中，点E在BC边上，且AE⊥BC于点E，ED平分∠CDA，若BE：EC=1：2，则∠BCD的度数为____ 

A .One day, Mr. Li and Mr.King go to London to see their friend Tom. They don't know much English and they don't know about London, either.

B .They go up to him and ask the way. The man smiles but says nothing. Then he puts his hand into his pocket (口袋）and takes out a book. He opens the book and reads, “I'm sorry, I can't speak English.”

C .Mr. Li and Mr King have a good friend His name is Tom Smith. He lives in London.

D .In the evening, they find their friend's home with the help of a policeman (警察).

E .And they can't find Tom's home. They walk in the street for a long time. Then they see a man near a bus stop.