Li Hua studies English very _____and her English is _____in her class.

A．careful, good

B．carefully, well

C．careful, best

D．carefully, the best

桥梁按其结构受力不同可分为三类，下列不属于该分类的是（）。

A、石桥

B、梁桥

C、拱桥

D、斜拉桥