A:isn't
B:didn't
C:wasn't
D:doesn't
A new trading agreement _______ between Holland and Denmark.
(Ⅰ)判断函数f(x)的单调性,并说明理由
(Ⅱ)若x∈1,2,不等式f(x)≥e﹣x恒成立,求a的取值范围.
根据课文《桂林山水》内容填空。
与“桂林山水甲天下”相呼应的句子是:____。