A floating constant consists of an integer part,a decimal point,afraction part, an e or E, and an optionally signed integer（）.

A.exponent

B.order

C.superfluous

D.superior

（）的特点之一是演唱者、演出的参与者同时也是欣赏者。

A、木偶剧

B、哑剧

C、话剧

D、目连戏