I must think of a proper gift for my mother，       won’t be expensive but will make her happy.

A．who that

B．the one which

C．it

D．one that

用刻度尺测量一张课桌的宽度，记录的数据是0.546米，这把刻度尺的分度值是[ ]

A.1米

B.1分米

C.1毫米

D.1厘米