题目

Cindy ,Jerry and Mary are giving their opinions about a good friend. Cindy: I think a good friend should be honest(诚实的). That’s more important than any other thing . If a friend isn’t honest, he may lose his friends’ trust(信任). Jerry: I think a good friend has to be generous. Here “generous” doesn’t mean he has to give his friends his money or his clothes. It means he should share(分享) his ideas and feelings with his friends. In fact, his friends can know him better in this way. Mary: In my opinion, a good friend should understand(理解) his friends. When there’s如图，AB是⊙O的直径，点A、C、D在⊙O上，过D作PF∥AC交⊙O于F、交AB于E，且∠BPF=∠ADC．（1）判断直线BP和⊙O的位置关系，并说明你的理由；（2）当⊙O的半径为，AC=2，BE=1时，求BP的长．