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The whiteness of a fabric brightened and then washed repeatedly at home

  • A.rises steadily with each wash given
  • B.is quite unaffected by any washing at all
  • C.depends only on the water temperature
  • D.falls unless the detergent contains one

Answer: D

Domestic detergents carry brighteners precisely to replace what is lost, which is why washed cottons keep their appearance. Without them the original treatment washes off over a number of cycles. Detergent brighteners are chosen for cotton.

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