阔叶树材木素中主要是紫丁香基苯丙烷单元。
参考答案：错
He had ________ that he had difficulty finding a job.
A．so little education
B．such little education
C．such a little education
D．so a little education
药品：药房：药方。（）
A.旅行：飞机：机票
B.桌餐：饭店：菜单
C.存款：银行：银行卡
D.电影：影院：电影票
