在学习英语的过程中，单元测评是检验我们学习效果的重要方式之一。今天，我们就来一起探讨人教版高中英语必修第一册Unit 4部分的测评内容，并为大家提供详细的答案解析。
本单元的主题围绕“环境保护”展开，通过阅读理解、语法练习和写作任务等形式，帮助学生提高语言运用能力的同时，增强环保意识。以下为具体的测评内容及答案：
阅读理解
Passage 1: The Importance of Recycling
文章讲述了回收利用的重要性及其对环境的影响。问题如下：
1. What is the main idea of this passage?
- A) The benefits of recycling
- B) The history of recycling
- C) The process of recycling
- D) The future of recycling
Answer: A) The benefits of recycling
2. According to the passage, how does recycling help reduce pollution?
- A) By reusing materials instead of throwing them away
- B) By creating more jobs in the recycling industry
- C) By increasing the demand for raw materials
- D) By promoting the use of plastic products
Answer: A) By reusing materials instead of throwing them away
Passage 2: Protecting Endangered Species
这篇文章介绍了保护濒危物种的方法。问题如下：
1. Why are many species becoming endangered?
- A) Due to natural disasters
- B) Because of human activities
- C) Due to climate change
- D) All of the above
Answer: D) All of the above
2. Which of the following is NOT mentioned as a way to protect endangered species?
- A) Establishing protected areas
- B) Banning illegal hunting
- C) Reducing greenhouse gas emissions
- D) Promoting sustainable agriculture
Answer: C) Reducing greenhouse gas emissions
语法练习
完成下列句子，使用适当的时态或语态。
1. Last week, the students _______ (visit) the local recycling center.
- Answer: visited
2. If it rains tomorrow, we _______ (cancel) the picnic.
- Answer: will cancel
3. The book _______ (write) by John Smith last year.
- Answer: was written
写作任务
假设你是李华，给你的外国朋友Mike写一封信，介绍你所在城市的环保措施并提出建议。信件应包括以下要点：
- 简要描述你所在城市的环保措施（如垃圾分类、植树活动等）
- 提出至少两点关于如何进一步改善环境的建议
Sample Answer:
Dear Mike,
I hope you are doing well. I want to tell you about some environmental protection measures in my city. We have implemented a strict garbage classification system and organized regular tree planting activities to improve air quality.
To further enhance our environment, I suggest that we increase public awareness campaigns about recycling and encourage more people to use public transportation. This way, we can reduce pollution and make our city cleaner and greener.
Looking forward to hearing from you soon.
Best wishes,
Li Hua
通过以上测评，我们可以看到环境保护不仅是个人的责任，也是全社会共同的任务。希望大家能够从自身做起，为地球的可持续发展贡献一份力量。
希望本次测评能帮助大家更好地掌握本单元的知识点。如果还有任何疑问，请随时提问！
