听力音频：
Task1：
Some people say that childhood is the best time in a person’s life. Other people disagree. What is your opinion? Explain why.
Task2：
The man expresses his opinion of the student’s proposal in the letter. State the man’s opinion and explain the reasons he gives for holding that opinion
Community Service Requirement
A university education should encourage students to engage with the world around them, but I see less and less of that engagement on campus today. I propose, therefore, that the university make community service, such as working with the local children in town, a mandatory activity for all university students before they graduate. Creating a community service requirement is a good idea because it would strengthen the relationship between our school and the town. Additionally, in fulfilling the requirement, many students would discover a love of service that would inspire them to a lifetime of volunteer work in their future communities.
Sincerely,
Sarah Brown
Task3：
Explain how the example discussed by the professor illustrates a systems thinking approach to problem solving.
Systems Thinking
Companies have designed new and improved ways to solve problems within their organizations. Rather than seeking a simple cause and a direct solution to problems, companies are now using an approach called systems thinking. Systems thinking involves solving problems long-term by considering the “big picture,” that is, how the interaction of many different parts of a large system may contribute to a problem. Companies use systems thinking because, even though it may produce complex solutions that take a long time to implement, it is an effective way to solve problems and has a greater long-term benefit to the company.
Task4：
Using points and examples from the lecture, explain what determines animals’ 24-hour activity cycle.
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