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19 January, 10:43

What is the central idea of the passage?

Invisible ink isn't really invisible at all

Lemon juice is the earliest form of invisible ink

British agents used invisible ink to send secret

messages

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Allen

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Answers (2)
  1. 19 January, 11:32
    0
    Answer: D
  2. 19 January, 12:00
    0
    invisible ink is not really invisible

    Explanation
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