请问一道数学题

答案是D

第二个在什么情况下可以成立呢？

[attachimg]71044[/attachimg]

图在这里，呵呵，不好意思

呃，看不太清

If x is positive, which of the following could be the correct ordering of 1/x,2x, and x^

I.   x^< 2x< 1/x

II.  x^< 1/x< 2x

答案 I and II only