What does the passage mainly discuss? According to the passage, the invention of the visible-light microscope allowed scientist

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问题 What does the passage mainly discuss?
According to the passage, the invention of the visible-light microscope allowed scientists to ______.

选项 A、see viruses directly
B、develop the electron microscope later on
C、understand more about the distribution of the chemical elements
D、discover single-celled plants anal animals they had never seen before

答案D

解析 本题考查对文章细节的了解。本题是考对最初的光学显微镜的评价,可从第一段第二句话中得到答案。"The invention of the visible-light micro scope late in the sixteenth century introduced a previously unknown realm of single-celled plants and animals"。
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