讨论是在北美发现的土堆（Mima Mound）形成的原因是什么。

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Directions: You have 20 minutes to plan and write your response. Your response will be judged on the basis of the quality of your writing and on how well your response presents the points in the lecture and their relationship to the reading passage. Typically, an effective response will be 150 to 225 words.

题目原文：

听力材料：

These three theories are all unconvincing at all.

1. It cannot be created by human labor because there are no human activities and remains to support the theory.

2. Earthquake is impossible to take place in where Mima Mound existed. Besides, there were no enough earthquake to loosen the soil.

3. There are gophers nowadays, but no new Mima Mounds have been found.

阅读材料：

Three theories to explain how the Mima Mound is formed.
1. Mima Mounds were formed by human labor because they were arranged in order.
2. Mima Mounds were caused by earthquake. After shaking, the land becomes loose and reshape to the Mima Mound.
3. Built by pocket gopher to build nest.

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讨论是在北美发现的土堆（Mima Mound）形成的原因是什么。

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