黄棕壤成土特点包括（）。
A.淋溶作用
B.粘化作用
C.弱富铝化作用
D.黄化作用
E.强富铝化作用
参考答案：A, B, C
用竖式计算．（带*的要验算）
48÷2=
*62÷5=
76÷3=
80÷6=*
93÷3=
92÷7=
They have been skating _______. [ ]
A. for three hours ago
B. since three hours ago
C. three hours ago
D. since three hours
