在菱形ABCD中，AE、AF分别垂直平分边BC、CD，则∠EAF=（ ）°．
60
Ⅱ类汽车库停车数量为（）辆。
A、＞300
B、151～300
C、51～150
D、≤50
By the time we arrived at the railway station, the train _________. As a result, we missed the train.
A．left
B．is leaving
C．had left
D．leaves
