2006系统内超赔保障合同的索赔基础是事故发生制
参考答案：对
改错。
( ) 1. He sometimes goes sking. _________________
A B C
( ) 2. My mother often walks to home. _________________
( ) 3. What are you do? _________________
( ) 4. Let's makeing him a good hot supper. _________________
( ) 5. Where are the children play? _________________
土壤形成过程中最活跃的因素是
A．成土母质
B．地形
C．气候
D．生物
