His proposal is so idealistic that there are manydifficulties in putting it into practice

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A. familiar
B. relative
(答案→)C. practical
D. terrible
解析：考查词义辨析。familiar 熟悉的，relative 相对的，practical实际上, terrible可怕的，句意：他的建议如此的现实主义以至于在投入实践中有许多实际的困难。所以选C。