物体的加速度为2m/s2,表示这物体 ( )
A.每秒运动2m
B.每经过1秒,其速度增大2m/s2
C.每经过1秒,其速度增大2m/s
D.每经过1秒,其速度增大2m
答案:C
居住区的规划结构指的是( )。
A.居住区规划的大致雏形
B.居住区规划的细部结构
C.居住区解决住宅与公共服务设施等相互关系而采取的组织方式
D.居住区解决人口与住宅等相互关系而采取的组织方式
—Jenny took the 8: 00 bus to Guangzhou this morning.
—Really? She ________ the 9:00 train. It's much more comfortable and safer to travel by train.
A.could have taken
B.should take
C.must have taken
D.can take