Lawyers often make higher _____ for their work than they should.

A．bills

B．charges

C．prices

D．costs

妊娠期血液系统的变化正确的是

A．网织红细胞轻度下降

B．白细胞的增加到妊娠晚期达高峰

C．红细胞沉降率减少

D．血小板明显增加

E．血浆纤维蛋白原增加