Are you afraid____(of, to) fire, Mr. Li?
下列农业、畜牧业种类与地区连线正确的是( )
Now, there are lots of buses and ____.
甲、乙、丙三人骑自行车匀速行驶,甲在1h内行驶了18km; 乙在30s内行驶了120m; 丙在3min内行驶了540m. 则三人骑车速度的快慢为( )