The situation was very dangerous; the enemies were attacking us _____.　　

A．in and around　　

B．from side to side　　

C．on all sides　　　

D．on the other hand

某食品加工厂自己投资建立了原材料生产基地，这种业务增长方式属于（）.

A．前向—体化 

B．后向—体化 

C．水平—体化 

D．水平多角化