class 9th English beehive chapter 1 the fun they had question - what was the big black screen used for?
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An accidental hit of the TV remote control or a wrong selection in the TV menu can cause a black box to appear on the television screen. This black box is one of two things: it may be a closed captioning box or it may be the picture-in-picture feature – both can be associated with a black box on the TV screen.
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the big black screen was used to read chapters, see homework and tests on the mechanical teacher 's black screen....
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