__________ hungry I am, I never seem to be able to finish off this loaf of bread.

A．Whatever

B．Wherever

C．However

D．Whenever

慢性化脓性中耳炎最常见致病菌是（）。

A.金黄色葡萄球菌

B.肺炎双球菌

C.革兰阴性杆菌

D.厌氧菌

E.两者以上细菌混合感染