采用“飞水法”粉碎（）
A．桃仁、酸枣仁
B．熟地黄、黄精
C．冰片、马钱子
D．朱砂、珍珠
E．樟脑、薄荷脑
参考答案：D
解方程：28×(x+4.95)=257.6
In that school, English is compulsory for all students, but French and Russian are ______.
A．special
B．regional
C． optional
D．original
