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Radium salts, which have been found to _____ in bones, give rise to cancers of the bone.


  1. A.
    pile up
  2. B.
    build up
  3. C.
    keep up
  4. D.
    pull up
B
  build up(="accumulate)" 积累。pile up 堆积。keep up 保持,维持。 pull up 停车。
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