保放结合，是指在开展保密工作时，要正确处理保密与信息公开的关系，做到（）。

A、保要害；保重点

B、保中心；保重点

C、保核心；保重点

D、保核心；保要害

Passage Three

Why do most of us hear women voices more clearly

A．Because their voices are more pleasant to listen to.

B．Because the possessing of voices in the brain is different.

C．Because listening to women requires more brain activities.

D．Because women’s voices are full of melodies.