[单选题]The plain occupies the west, south and central parts of the continent, though considerable variations are to be found over so （）an area.

expensive

expansive

extensive

intensive

正确答案：C

题目解析

考查形近词辨析。expensive“昂贵的”；expansive“扩张的，膨胀的”；extensive“广泛的，广阔的”；intensive“加强的，集中的”。根据题意，应选C。

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[单选题]The plain occupies the west, south and central parts of the continent, though considerable variations are to be found over so （ ）an area.