如图，AB是⊙O的直径，C是的中点，CE⊥AB于E，BD交CE于点F，

（1）求证：CF＝BF；
（2）若CD＝12，AC＝16，求⊙O的半径和CE的长。

下列有关光现象的说法中，正确的是（　　）

A Policeman and a Thief  
One day a policeman was taking a thief to the city . On the way , they saw a shop . The thief said . “ Let me go into the shop to buy some bread . We can eat it in the train . ”
The policeman agreed . The thief went into the shop and ran out of the back door . When the policeman knew that , he began to look for the thief everywhere . At last the policeman caught(抓获) thief again . They went on to the city . On the way they came to the same shop . The thief wanted to buy some bread again . “Oh , no . ” said the policeman , “You did that before , and you ran away . This time I^’ll go into the shop and buy bread . You must wait here for me . ”

—     . I just had some rice.