---Are things on the earth ________ they are on the moon?---No, they are much ________ on the earth than they are on the moon．A.as heavy as…heavierB.heavier as…heavierC.heavier…heavyD.so heavy as…heavier
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A解析疑问句．根据句意用同级比较as heavy as．后一句是比较级句型，所以要选heavier．正确