要从严把控“暂存类”和“了结类”问题线索，严禁（）或（）。
A.随意暂存
B.集中了结
C.长期暂存
D.随意了结
参考答案：C, D
You may do these exercises ________in class ________ after class, but you must finish them before
Friday. [ ]
A. either; nor
B. either; or
C. neither, nor
D. neither; or
甲苯的基本性质是什么？
