题干
The house rent is ____ higher. I get about half the space I had at home but I’ll have to pay _____ here.
A：far less; as much three times
B：far more; much as three time
C：little; three times as much
D：much; three times as much
答案(点此获取答案解析）
D
是
上的减函数，那么 a的取值范围是
