在联锁站联锁设备故障时需采用（）行车。
参考答案：电话闭塞法
Mrs Wang has taught _____ geography for two years and she teaches very well. [ ]
A. our
B. we
C. us
D. ours
蜜蜂：蜂蜜
A．橡胶：塑料
B．牛：牛肉
C．蚌：珍珠
D．鸟：鸟巢
