--- Really? Who will give ______ lecture? What is it about?

--- Professor Chen, ______ President of Peking  University, about pollution.

A．the; a

B．a; the

C．the; 不填

D．a; 不填

“转基因动物”是指（　　）

A．提供基因的动物

B．能产生人血清白蛋白的动物

C．能表达基因信息的动物

D．被导入了外源基因的动物