分级基金的复杂性大于普通基金，投资者在投资分级基金中应注意（）。

A.各种投资运作风险

B.无法取得约定收益的风险

C.遭受投资本金损失的风险

D.估值风险

The boy has to learn ________ things that he hardly has time for play.

A．so many

B．such many

C．so few

D．such few