A．
铁轨下铺枕木
B．
坦克装有履带
C．
刀刃磨得很薄
D．
书包背带很宽
答案：C
These days he has made _____ in his studies by working hard.
A．many progress
B．a lot of progresses
C．much progress
D．many a progress
增强大黄活血功效的炮制方法是（）
A.蜜制
B.土炒
C.酒制
D.醋制
E.姜制
