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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：
讨论关于birds anting这一习性的三种解释。
听力材料：
Refute the three explanations mentioned in reading passage.
1. It is just a coincidence between the time of feather change and bird anting.
2. Anting cannot reduce the growth of parasites on some birds.
3. Birds will have other things to rub themselves, but they do not tend to eat those things.
阅读材料：
Demonstrate three theories to explain why birds have the habit.
1. Birds use anting to irrigate skin during feather change in summer.
2. The acid released during anting by ants can help resist parasites growing on birds.
3. Anting is a way for birds to feed on those ants.
