_______________[A] cover [B] change [C] range [D] differ

—__________________— With pleasure. Emergency planning covers several different aspects.

We covered a wide______of topics in the interview.A．extentB．collectionC．rangeD．content

_________[A] invisible [B] limited [C] indefinite [D] different

_________(61)A.change B.changingC.to change D.bei

_________(57)A.change B.hydrogen C.oxygen D.memory

55._________A.change B.obtain C.cause D.affect