第15题: [单项选择]AIDS is causing great public concern because the ______ fatal disease hits primarily young people. A. invariably B. imperatively C. transiently D. deceptively 参考答案:A 答案解析:[解析] A选项invariably的意思是“不变的,总是”,如:All things invariably divide into two.(事物都是分为二的)。其他三项“B选项imperative