地黄饮子中少许薄荷的作用是（）
A.上行开郁
B.疏散风热
C.疏肝解郁
D.清利头目
E.利咽消肿
参考答案：A
如图几个图中，速度v，加速度a，已知物体相对于小车静止，地面不光滑，物体A在哪种情况下没有受到摩擦力（ ）
A．
B．
C．
D．
Our son doesn't know what to__________at the university; he can't make up his mind about his future.[ ]
A. take in
B. take up
C. take over
D. take after
