材料员不必深入施工现场，调查研究，掌握第一手资料。
参考答案：错
He is such a busy man that it’s hard for him to________ enough time to meet us at the airport.
A．offer
B．spare
C．prepare
D．order
治疗经行头痛之血瘀证，应首选（）
A.丹栀逍遥散
B.乌药汤
C.通窍活血汤
D.天仙藤散
E.龙胆泻肝汤
