通常情况下，子女高等教育金的支付期与（）时间上是高度重叠的。

A.住房首付准备期

B.退休金准备期

C.风险保障期

D.投资资金准备期

We found some precious jars and vases in an ancient tomb, ______you know , are valuable.

A．even the pieces of which

B．which even pieces

C．even the pieces of them

D．whose even pieces