开好政协会议的八字方针是什么？

《 * * 党宣言》和《物种起源》的发表是19世纪欧洲思想界的重大事件。二者都[ ]

A、抨击了分配不公现象

B、挑战了传统观念

C、揭示了生命演变规律

D、指导了国际工人运动

---Where ________ you last night? I called you, but got no answer.

---Sorry. I ________ out with my brother.

A．was; were

B．were; was

C．did; were

D．did; was

混凝土分层浇筑时，每层厚度不应超过振捣棒的（）倍。

A.1.25

B.1.5

C.2

D.2.5

五志化火

清营汤中配伍丹参的意义是什么？