下列关于位移和路程的说法错误的是（　　）

A．沿直线运动的物体，位移和路程有可能相等

B．质点沿不同的路径由A到B，其路程可能不同而位移是相同的

C．质点通过一段路程，其位移可能为零

D．质点运动的位移大小可能大于路程

You think your ruler is very long，but his is _________yours.

A．twice as long as

B．three as long as

C．twice longer as

D．once as longer as