常用的标准化形式有简化、统一化、（）和系列化。
A、标准化
B、通用化
C、程序化
D、过程化
参考答案：B
_____ he was very tired, he continued working in his office.
A．Since
B．Although
C．As soon as
D．Because
我国古代有“琴棋书画”之说，请问琴指什么？棋指什么？
