如图所示为四个物体在一条直线上运动的v-t图象，那么由图象可以看出，做匀变速直线运动的是[ ]
A．
B．
C．
D．
BC
Never give up your effort, ______ you are sure to get what you’re trying to get．
A．and
B．before
C．or
D．but
所谓“教师职业专业化”是说
