Achieving a high degree of proficiency(精通）in English as a foreign language is not a mysterious without scientific basis.
A. process
B. practice
C. procedure
D. program
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(答案→)A. process
B. practice
C. procedure
D. program
解析：句意：在作为外语的英语方面达到很高水平并非是一种毫无科学根据的神秘过程。process过程；practice实习，练习；开业；procedure程序； program课程，计划，大纲。本句强调的是学习英语的过程，应选A。