听力音频：
Task1：
Do you agree or disagree with the following statement? People today have healthier lifestyles than people did 100 years ago. Use specific examples and details to support your opinion.
Task2：
The woman expresses her opinion about the new policy. Briefly describe the policy. Then state the woman’s opinion about the policy, and explain the reasons she gives for holding that opinion.
No More Posters Outside the Student Cente
Traditionally, students have been permitted to put up posters advertising events, clubs, and activities on the concrete wall outside the main entrance to the student center Beginning next semester, however, students will no longer be allowed to attach anything to the front of the building According to a university official, the new policy is part of an effort to improve the campus’s appearance. “The posters on the wall make the building unattractive,” he said, “so they have to come down.” He added that posters can instead be displayed in the dining hall: “Students can use the bulletin board in the dining hall for posters, so the policy change should not be a problem.
Task3：
Explain how the professor’s example from the lecture illustrates warning coloration.
Warning Coloration
Many animals have defense mechanisms that help protect them from predators. In some cases, these animals have distinct coloring that signals predators of the presence of such defenses. This type of coloring is called warning coloration. If a predator does not recognize the meaning of this coloration and attacks, it may suffer significant discomfort or injury when its would-be prey employs its defense mechanism. As a result, the predator learns to associate the warning coloration with negative consequences, and will from that point forward avoid attacking animals that have that coloration.
Task4：
Using points and examples from the lecture, give two explanations for why we may remember some things better than others.
