The opening ceremony of Beijing 2008 Olympics is a great success, which is believed  ________ the Chinese splendid civilization.

A．having been displayed

B．to have displayed

C．to be displayed

D．displaying

儿童少年肥胖症的易发年龄阶段包括（）。

A.孕后期

B.婴儿期

C.幼儿期

D.青春早期

E.青春发育后期