双悬果呈椭圆形，分果背面有5条突起纵棱的药材是（）
A.蛇床子
B.砂仁
C.薏苡仁
D.牵牛子
E.地肤子
参考答案：A
分解因式：a3-2a2+a=______．
Even though the pure water is ____ gives sea water its main properties, the salinity of sea water affects both its weight and freezing point.
A．the one
B．which
C．what
D．that
