In the near future, more advances in cloning technology       by scientists.

A．are making

B．are made

C．will make

D．will be made

原发性急性肾小球肾炎最常见的病因为（）。

A.大肠杆菌

B.变形杆菌

C.β溶血性链球菌

D.葡萄球菌

E.副大肠杆菌