We never know____________ because happiness is everywhere.

A．how happiness will show up next.

B．where will happiness show up next,

C．how will happiness show up next,

D．where happiness will show up next,

细菌性肺炎最常见的病原菌是

A．葡萄球菌

B．肺炎球菌

C．肺炎杆菌

D．大肠杆菌

E．乙型链球菌