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Discussion

Fly ash and slag differ from limestone and clay in that they are

  • A.industrial by-products rather than quarried materials
  • B.quarried in exactly the same manner as limestone is
  • C.used only as kiln fuels rather than as raw materials
  • D.added to the kiln feed in very large proportions indeed

Answer: A

Using them replaces material that would otherwise be dug and burnt, which saves both quarrying and emissions. Their supply depends on other industries continuing to produce them, which is a real constraint on how far they can be relied upon.

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