（2015•广东佛山）阅读下面短文，用所给单词的恰当形式填空，使短文通顺、合理。每词限用一次，有一个多余的选项。

                                    information   find   if   million   serve   try   whether   power

 Are you interested in your family history? Do you want to discover who your ancestors (祖先) were? Would you like ____  an old school friend from your past? Then come to Friends and Family Finder! It's completely free. Simply put your personal ____  on our site. Share your photos and videos, Use our very ____ search machine to find members of your family and friends. We have over 20 ____ members.

 Don't worry____ you don't have enough time to do the research. ____  our “Finder for a Fee” and we will do all the work for you. You can pay online or send a check for $100. We are much better than other sites which offer the same____ , and quicker too.

So don't wait. Become a member today!

下列语句表示的图形是（只填序号）

①过点O的三条直线与另条一直线分别相交于点B、C、D三点： ____．

②以直线AB上一点O为顶点，在直线AB的同侧画∠AOC和∠BOD： ____．

③过O点的一条直线和以O为端点两条射线与另一条直线分别相交于点B、C、D三点：　 ____

日本福岛第一核电站发生严重的核辐射泄漏，日本政府向福岛核电站附近居民发放碘片(${}_{53}^{127}I$)，以降低放射性碘对人体的伤害。已知核辐射中放射性碘（碘${}_{53}^{131}I$）的核电荷数为53，则下列说法正确的是            （      ）