在学习《全新版大学进阶英语视听说教程4》的过程中，课后习题是检验学习效果的重要环节。本篇内容将针对第5和第6单元的课后习题提供详细的参考答案与解析，帮助大家更好地掌握相关知识点。

第五单元

1. 听力理解

- 问题：What is the main idea of the listening passage?

- 答案：The main idea is about the importance of time management in daily life.

- 解析：通过仔细聆听，可以发现文章多次提到合理安排时间对提高效率的重要性，因此总结出主旨为时间管理的重要性。

2. 对话练习

- 问题：How should you respond when someone asks if you have free time tomorrow?

- 答案：You can say, "I'm not sure yet, but I'll let you know as soon as possible."

- 解析：此题考察的是礼貌地回应他人邀请或询问的方式，使用"not sure yet"表达不确定性，并承诺尽快回复以示诚意。

第六单元

1. 词汇运用

- 问题：Fill in the blank with an appropriate word: He was ______ by his colleagues for his excellent performance.

- 答案：commended

- 解析："commended"表示称赞、表扬的意思，在这里用来形容同事对他优秀表现的认可，符合语境。

2. 写作任务

- 问题：Write a short paragraph describing your ideal vacation spot.

- 示例答案：My ideal vacation spot would be a quiet beach surrounded by lush greenery. The sound of waves crashing against the shore combined with the fresh ocean breeze creates a perfect atmosphere for relaxation and reflection.

以上仅为部分习题的答案及解析，希望对大家有所帮助。继续努力学习，相信你们会在英语视听说方面取得更大的进步！