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本題由lindy提供
If x is positive, which of the following could be
(A) None
(B) I only
(C) III only
(D) I and II only
(E) I, II, and III
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答案：
D
X>0
Ⅰ：部分正確（比如x>1時，不滿足；這個只滿足：X為0-1之間的時候）
Ⅱ：部分正確（比如x>1時，不滿足；這個只滿足：X為0-1之間的時候）
Ⅲ：不成立（如果x在0-1之間，比如0.5，不成立；如果>1,還是不成立，比如2）
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