劳动生产力水平处于绝对劣势的国家，对外贸易也可以取得经济效益，但这种经效益是相对的。 ( )
参考答案：对
直肠黏膜与肛管皮肤之间形成的不整齐线称齿线。
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
