_____ by a black hole, Li Yanping was so frightened at first, but he calmed down later and

tried his best to escape.

A．Caught

B．Catching

C．To catch

D．Catch

储罐按形式分类，可分为立式储罐和（）。

A、地上储罐

B、地下储罐

C、卧式储罐

D、球形储罐