1. Dating from around A.D 1000, the largest mound surviving from the Missippia culture was one hundred foot high and had a base of nearly fifteen acres.
A): C WHY NOT A
2. The particles in a clay soil are so fine that it tends to be compact and interferes with the oxygen supply for plant roots.
A): A WHY NOT C作者: tongxun 时间: 2003-7-9 22:45
能告诉咱们是在那里划线的吗？
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