Ａlot of language learning,       has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.

A．as

B．it

C．which

D．this

解放思想和实事求是的关系是（）

A.解放思想是实事求是的前提

B.实事求是是解放思想的目的

C.解放思想就是实事求是

D.解放思想不能离开实事求是

E.解放思想和实事求是是统一的