Some people won't realize the importance of their health they have lost it.
A:when
B:until
C:after
一艘轮船每小时航行15千米,4小时可以到达目的地.如果要3小时到达,每小时应航行( )
仔细观察下边的漫画(Iraq、Afghanistan、Balkan分别指伊拉克、阿富汗、巴尔干),在冷战结束后屡屡发生漫画中的局面的主要原因是( )