记载周代礼乐文明的典籍是什么？
参考答案：典籍是周礼。
— What are the students doing?
— Some _ books and others at the blackboard. [ ]
A. are looking; are reading
B. are reading; are watching
C. are watching; are looking
D. are reading; are looking
进行药物监测的适用情况。
