We should go to school at 8:00 ______ school mornings. [ ]
A. at
B. in
C. on
D. of
答案:C
进入青春期后,性意识开始萌动,常出现不正常的心理变化。 [ ]
DF11内燃机车牵引区段,某站旅客列车到发线有效长605m,按11m换算时,该线换算容车数为()。