句子各部分是什么成分?尤其Of those 为什么在句首?主语?

题目

句子各部分是什么成分?尤其Of those 为什么在句首?主语?
Of those fast-growing countreis, China,whose economy has been growing at 9 percent per year,is particularly successful

答案

Of those fast-growing countreis（地点状语,为了强调置于句首）,China主语）,whose economy has been growing at 9 percent per year（定语从句）,is particularly successful（主句谓语---系表结构）
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