为什么在巷道行走时必须走人行道？
参考答案：由于行道内有矿车、输送带等设备，在非人行道行走时，其空间达不到要求，无法保障人员安全，可能会被运行车辆挤碰。
表达式(7\3+1)*(18\-1)的值是______。
________, Mr. Smith managed to send his daughter to school.
A．As he was a poor man
B．A poor man as he was
C．Poor man as was he
D．Poor man as he was
