—Is this your baseball, David?   —No, it's not     . It's Helen's.

A．his

B．yours

C．mine

D．hers

大叶性肺炎可出现（）

A.铁锈色痰

B.粉红色泡沫痰

C.大量脓痰

D.白色黏液泡沫状痰

E.红棕色黏稠痰