Scientists across the world agree that this is an invention of _______ great significance, _______ invention

that will greatly change human life.[ ]

A. a; the

B. a; an

C. / ; the

D. / ; an

用“泡心法”调制米粉面坯，如沸水掺入太少，则( )。

A．成品易裂口

B．成品粘牙

C．成品不糯

D．皮坯粘手，难以成形