00294    a2200121   4500001000700000020001500007041000800022100001600030250001100046040002500057245005900082260003100141113788  a0070864683  apor  aGue, David.  a1. Ed.  aBR-BrIDEAcBR-BrIDEA10aScience Focus 7bteacher´s resource guidec David Gue  a[S.l.]bMc Graw Hillc2001