作家对人物事件和环境作概括的说明和交代的表达方式被称为（）
A.叙述
B.描写
C.抒情
D.议论
参考答案：A
It's too bad that my computer has got a new virus. If only I _____ that programme! [ ]
A. didn't run
B. haven't run
C. hadn't run
D. wouldn't run
G.652光纤在1310nm波长区的模场直径标称值在什么范围，偏差小于多少？
