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  3. Passage Three What is the author’s purpose of mentioning various observation devices and methods?

Passage Three What is the author’s purpose of mentioning various observation devices and methods?

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问题     Passage Three
What is the author’s purpose of mentioning various observation devices and methods?
选项
答案To expose and analyze the difficulty of observing the planet．
解析 根据题干提示定位至第四段至第六段。作者在第四段探讨了观测新行星的若干设备，表明这些设备造价昂贵，而在第五段和第六段中又分析了观测这颗行星可能遇到的两个主要障碍，这些都说明观测这颗新行星有诸多困难，故答案为“To expose and analyze the difficulty of observing the planet．”。
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