Studies have shown that children grow and develop quite normally on a diet ___ plenty of bread and vegetables with small amounts of milk and meat.

A．is consisted of

B．consists of

C．consisted of

D．consisting of

随机性效应指的是（）与照射剂量的大小有关的一类效应。

A、严重程度

B、发生概率

C、剂量阈值

D、危险程度