TPO22 the birth of photography - 英檢

Paragraph 2: 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.

Paragraph 3: 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.

4. According to paragraph 2 and 3, which of the following did the
daguerreotype and the calotype have in common?
○They were equally useful for artists.
○They could be reproduced.
○They produced a permanent image.
○They were produced on treated paper.

答案是C:

這題一直找不到calotype可以produce a permanent image的句子在2.3段。

其中題目也沒有infer的字樣，如果有還可以推論chemical是不可逆的，

希望可以幫忙解惑，謝謝。

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