第21题: [单项选择]Achieving a high degree of proficiency in English as a foreign language is not a mysterious______without scientific basic. A. process B. practice C. procedure D. program 参考答案:A 答案解析:名词辨析。practice意为“惯例”,program意为“项目”,均与句意不符;procedure意为“程序,步骤”,一般指按照规定、要求完成某事的过程,如legislative procedure