A.Radiation at low levels is harmless. B.Radiation produces cells in a strange way. C.Radiation can lead to cancer. D.Radiation's damage is obvious.
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举一反三
【简答题】s___ v. move from one place or position to another or make sth. do this (使)转移(地点或位置) n . [C] a change in the way people think about sth., in the way sth.isdone, etc.( 想法,做法等的)改变