依照中国传统的五行观，玄武位于（）方，五行属（）。
参考答案：北；水
There comes a time in every man's life_____.
A．that he needs to think
B．when he has to think
C．therefore he has to work hard
D．then he will need it
矿井地质条件分类表示方法中c代表褶曲。（）
