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（请给出正确答案）
The plain occupies the west,south and central parts of the continent,though considerable variations are to be found over so（ ）an area.
A.expensive
B.expansive
C.extensive
D.intensive
B.expansive
C.extensive
D.intensive
参考答案
参考解析
解析：extensive“广泛的，广阔的”。A.expensive“昂贵的”；B.expansive“扩张的，膨胀的”；D.intensive“加强的，集中的”。
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