根据短文内容，判断下列句子的正误 。

A

       If someone asks me, “Do you like music?”I'm sure I will answer him or her” Of course, I do.” Because I think music is an important part of our lives.

　　 Different people have different ideas about music. For me, I like rock music because it's so exciting. And my favourite rock band, the” Foxy Ladies (酷妹) “is one of the most famous rock bands in the world. I also like pop music. My classmate Li Lan loves dance music, because she enjoys dancing. My best friend, Jane, likes jazz music. She thinks jazz is really cool.

     “I like dance music and rock very much，”says my brother,“because they are amazing.”

　　But my mother thinks rock is boring.“I like some relaxing music，”she says. That's why she likes country music, I think.

如图，AB是⊙O的弦，D为半径OA的中点，过D作CD⊥OA交弦AB于点E，交⊙O于点F，且CE=CB．

（1）求证：BC是⊙O的切线；

（2）连接AF、BF，求∠ABF的度数；

（3）如果CD=15，BE=10，sinA=$\frac{5}{13}$，求⊙O的半径．