答案:C
There are many tall trees _____ the two buildings. [ ]
A. between
B. in
C. on
D. under
一辆长30m的大型平板车,匀速通过70m的长桥所用的时间为10s,它以同样的速度通过另一座桥时,所用的时间为20s,那么这座桥的长度是多少米?