请阅读下面短文。根据短文内容从下面方框内的七个选项中，选择五个还原到文中，使短文意思通顺、结构完整。（每小题2分）

There’s a music club at Hongxing Primary School.    小题1: 　 Look! Anna, Bob and Leo like singing and they’re singing an English song with the help of their music teacher.  小题2:  .Mike can play the saxophone well. Alice is playing the drums. It is the new team of the club.    小题3:  .They will give a show at the party on Sunday evening. Daniel is a quiet boy.    小题4:    He doesn’t like to talk with others. A few minutes later, Mike and Tom come in and invite him to join their team.   小题5: And now they are playing music together.

为防止含高浓度放射性物质的污水从福岛第一核电站2号机组取水口附近的电缆竖井内流入海中，东京电力公司4月3日曾尝试向竖井“上游”灌注吸水后会膨胀的“高分子聚合物”，以阻止污水排放。请问：若有机物通过加聚反应生成高聚物，还能水解生成两种有机物，则这种有机物的结构中一定具备的基团有

A．①②⑤

B．②③⑤

C．②④⑤

D．①②⑥