Many diseases that used to be considered ______ of mankind are now easily treatable with antibiotics.

【正确答案】 A

【答案解析】 句意：很多过去认为是人类灾难的疾病现在可以容易地用抗生素治愈。scourge灾害；鞭子。blight虫害。torture拷问，刑讯。thorn刺。