At the end of each month when he comes b
题型：选择题
问题：
At the end of each month when he comes back from school he will be asked by his strict father to ___________ where every cent goes.
A．watch over
B．put forward
C．account for
D．set off
题型：选择题
如图所示，蜡块在竖直玻璃管内的水中匀速上升，速度为v．若在蜡块从A点开始匀速上升的同时，玻璃管从AB位置由静止开始水平向右做匀加速直线运动，加速度大小为a，则蜡块的实际运动轨迹可能是图中的（ ）
A．直线P
B．曲线Q
C．曲线R
D．无法确定
