— You can speak French well. Who taught you? 

—Nobody. I learnt it all by ______.[ ]

A. me

B. myself

C. it

D. itself

肺炎所致酸碱失衡的患儿可出现（）。

A.代谢性酸中毒

B.代谢性碱中毒

C.呼吸性酸中毒

D.呼吸性碱中毒

E.代谢性酸中毒和呼吸性酸中毒