总数： 0 正确： 0 错误： 0

an area of land that has not been used to grow crops or had towns and roads built on it, especially because it is difficult to live in as a result of its extremely cold or hot weather or bad earth

A functional√ (正确答案是：A)
B futile√ (正确答案是：B)
C depreciation√ (正确答案是：C)
D wilderness√ (正确答案是：D)