1. controversial
【用法】controversial是形容词，意为“争论的，争议的”。
【考例】Whether the buildings in this area should be pulled down has remained _____; people are still looking for other possible solutions. (湖北 2012)
A. unchallenged B. relevant
C. controversial D. contradictory
【点拨】选C。由题中的people are still looking for other possible solutions可知，这件事情意见不统一，有争议（controversial）。unchallenged未受到挑战的，未引起质疑的；relevant相关的；contradictory相互矛盾的。
