Everyone colorblind test.
As long as the teacher can afford a pen, the teacher could have written "gelb", "brün", "rot", "grün", "blau", usw. before photocopying the color page in black and white...Well as it’s an German English Training Workpaper it’s makes sense: German Teachers had to copy then back then as the Schools ditnt got the money to provide enough books for the Class, and copy’s are also expensive.. so b/w copies are quite common there..
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Or accept answers like: white, grey and black.As long as the teacher can afford a pen, the teacher could have written "gelb", "brün", "rot", "grün", "blau", usw. before photocopying the color page in black and white...
"gelb", "brün", "rot", "grün", "blau"