在英语考研07年的真题中，以下是对部分题目的原创答案：
1. What is the main purpose of the passage?
答案：The main purpose of the passage is to inform the reader about the recent advancements in renewable energy technology.
2. According to the passage, how do the researchers propose to improve the efficiency of solar panels?
答案：The researchers propose to improve the efficiency of solar panels by using a new material that absorbs a wider range of wavelengths of light.
3. Why does the author mention the "silent spring"?
答案：The author mentions the "silent spring" to emphasize the environmental impact of chemical pollution and to illustrate the importance of sustainable practices.
4. Choose the word that best completes the sentence: "The speaker's tone is most likely ____________."
答案：critical
5. Which of the following statements is NOT mentioned in the passage?
答案：The passage does not mention that the new drug is completely free of side effects.
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