The traffic is not busy now. We _____ arrive before dark. [ ]

A. should

B. mustn't

C. need

D. can't

妊娠高血压综合征的最主要的基本病理生理变化是

A．肾小管重吸收增加

B．血中尿酸增加

C．全身小动脉痉挛

D．谷丙转氨酶增高

E．低血容量