________she is not so healthy _______she used to be?

A．Why is it that; what

B．Why it is that; that

C．Why is it that; as

D．Why it is that; who

控制区内（）塑料袋用于收集有放射性的重复使用的物品。

A.红色

B.白色

C.蓝色

D.黄色