锅炉具有爆炸性。锅炉在使用过程中发生破裂，使内部压力瞬时降至( )外界大气压的现象叫爆炸。

A．大于

B．等于

C．小于

D．无法确定

The news of the Ministry's coming to our school for a visit was  ____  on the radio yesterday.[ ]

A. turned out

B. found out

C. given out

D. carried out