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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：
犀鸟（toucan bird）的巨大的鸟嘴的三种功能。
听力材料：
None of the 3 reasons about the bill’s function is reasonable.
1. It cannot function as weapons. It is made of hollow bones filled with air, so it is thin and lightweight or else it cannot fly. If it is used as a weapon, it will be easily damaged in activities like jabbing.
2. They have to call out to each other in order to use the color and shape to blend into surrounding areas. If they do this, they are going to draw attention from predators.
3. Healthy toucan does n
阅读材料：
3 reasons can explain why toucan evolved a bill.
1. Weapons against predators
2. Color and shape to hide from predator
3. Get rid of excess body heat
