在阅读理解部分，以下是对英语一阅读理解的答案解析：
1. 问题：What is the main idea of the first paragraph?
答案：The first paragraph introduces the topic of climate change and its impact on human life.
2. 问题：According to the author, what is the most significant factor affecting global warming?
答案：The author believes that the most significant factor affecting global warming is the increase in greenhouse gas emissions.
3. 问题：Why does the author mention the example of the polar bear in the second paragraph?
答案：The author mentions the example of the polar bear to illustrate the severe impact of global warming on wildlife.
4. 问题：What is the author's opinion about the effectiveness of the Paris Agreement?
答案：The author believes that the Paris Agreement is a significant step forward in addressing global warming, but more efforts are needed to achieve its goals.
5. 问题：What does the author suggest as a solution to global warming in the last paragraph?
答案：The author suggests that reducing carbon emissions and promoting renewable energy sources are essential steps to combat global warming.
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