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  3. What does the passage mainly discuss? Why does the author mention the visible-light microscope in the first paragraph?

What does the passage mainly discuss? Why does the author mention the visible-light microscope in the first paragraph?

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问题 What does the passage mainly discuss?
Why does the author mention the visible-light microscope in the first paragraph?
选项 A、To begin a discussion, of sixteenth-century discoveries.
B、To put the X-ray microscope in a historical perspective.
C、To show how limited its uses are.
D、To explain how it functioned.
答案B
解析 本题考查了解文章如何布局，以及各段之间承接关系的能力，属于难度较高的题。文章第一段介绍了显微镜的发展，并由此引出展开，详细介绍了x射线显微镜的发展情况。因此，文章开始提到光学显微镜是为了对显微镜的发展作一个历史回顾。
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