Only after ____ to go to school. [ ]

A. New China was founded; he was able

B. was New China founded; was he able

C. New China came into being; was he able

D. New China founded; he was able

下图是人体部分生理活动示意图，请据图回答下列问题：  

(1)食物中的蛋白质进入B系统后在____________部开始被消化，最终在小肠内被消化成_____________。

(2)氧气进入人体后，最终在____________处被利用。与①相比，②中的______________气体增多。

(3)当__________________发生病变而通透性增高时，C中就会出现红细胞和蛋白质。