题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。A writing club is a group consisting of writers who meet together toshare and comment on manuscripts (手稿).People who writestories, poetry, or even non-fiction articles can join a writing club. But the usual site is in a library, bookstore, private home,or a school. Joining a club allows writers to understand thechallenges of being a writer. And members of a writing club can receiveconstructive criticism (评论) from their fellow writersso that they can learn how to ma已知在Rt△ABC中，∠ABC=90°，O为△ABC中∠B和∠C的外角平分线的交点，以O为圆心，OB为半径的⊙O与△ABC的三边所在的直线交于D、E、F、G．（1）证明：BE=BG=DF；（2）若AE=16，CG=2，求△ABC的周长．