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托福阅读句子插入题：The Birth of Photography

2015-08-24 16:24:49来源：网络

　　【托福阅读题型：The Birth of Photography句子插入题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子插入题

　　托福阅读句子插入题：The Birth of Photography

　　Unlike most major inventions, photography had been long and impatiently awaited. The images produced by the　camera obscura, a boxlike device that used a pinhole or lens to throw an image onto a ground-glass screen or a piece of　white paper, were already familiar—the device had been much employed by topographical artists like the Italian painter　Canaletto in his detailed views of the city of Venice. What was lacking was a way of giving such images permanent form.　This was finally achieved by Louis Daguerre (1787-1851), who perfected a way of fixing them on a silvered copper plate.　His discovery, the "daguerreotype," was announced in 1839.■

　　A second and very different process was patented by the British inventor William Henry Talbot (1800-1877) in　1841.■ Talbot's "calotype" was the first negative-to-positive process and the direct ancestor of the modern photograph.　The calotype was revolutionary in its use of chemically treated paper in which areas hit by light became dark in tone,　producing a negative image.■ This "negative," as Talbot called it, could then be used to print multiple positive images on　another piece of treated paper.■(The Birth of Photography)

　　Look at the four squares HI that indicate where the following sentence could be added to the passage

　　Although his process produced permanent images, each was unique and no reproduction of the picture was possible.　Where would the sentence best fit?

　　Click on a square [■] to add the sentence to the passage.

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 句子插入题

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