听力音频：
Task1：
Some teachers think that it is important for students to sit in assigned seats, that is, to sit in the same place every day in class. Other teachers think that students should be allowed to choose where they will sit, and they allow them to sit in different seats on different days. Which do you think is better? Explain why.
Task2：
The man expresses his opinion about the proposal described in the letter. Briefly summarize the proposal. Then state his opinion about the proposal and explain the reasons he gives for holding that opinion.
Make Textbook List Available Earlier
Students always have to wait until the beginning of the semester to find out which textbooks they will need for their new courses. But since a lot of students register early for their courses, I think that the list for each course should be available immediately at the time of registration. This would give students more time to shop around to find less expensive textbooks. And it would also allow them to start work on the teaching for their new courses early.
Sincerely
Alexandra Brown
Task3：
Explain how the example from the lecture illustrates the concept of procedural memory.
Procedural Memory
The memories people form when they learn names and facts are different from the memories they form when they learn how to perform a task. These memories of performing particular actions are called procedural memories. Procedural memories are memories of the process of performing a task that become automatic with practice. Once a task has been practiced, or repeated many times, procedural memories are established. These procedural memories allow people to perform the action automatically and to recall it relatively easily many years later.
Task4：
Using points and examples from the lecture, explain two disadvantages of living in groups for animals.
