甲型溶血性链球菌生长时，菌落周围常出现溶血环，此现象称为（）

A.α溶血

B.β溶血

C.γ溶血

D.δ溶血

E.ε溶血

We can see          and          in Australia.

A．sheeps; kangaroos

B．sheeps; kangarooes

C．sheep; kangarooes

D．sheep; kangaroos