–Which hair band do you like best, madam?–I can't decide now. I really don't know _________.
A:to choose which one
B:choose which one
C:which one to choose
D:which one I should choose it
将四株大小相似的同一种植物的健壮幼苗,分别培养在下列液体中,生长最快的是( )
成语“鹬蚌相争”中的“蚌”是一种软体动物,其体内与外界气体交换的场所是____ ,“鹬”是一种鸟,其呼吸器官是____ .
(Ⅰ)若a=1,求曲线y=f(x)在点(1,f(1))处的切线方程;
(Ⅱ)若函数f(x)在其定义域内为增函数,求a的取值范围;
(Ⅲ)在(Ⅱ)的条件下,设函数 g(x)=ex ,若在1,e上至少存在一点x0,使得f(x0)≥g(x0)成立,求实数a的取值范围.
成语“大汗淋漓”体现的生物的生命现象是( )
小明的选择合理吗?从概率的角度进行分析(要求用树状图或列表方法求解)