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【单选题】
若a＞b＞0，全集U=R，A={x| ab ＜x＜a}，B={x|b＜x＜ a+b 2 }，则（? U A）∩B为（ ）A.
{x|b＜x≤ ab }
B.
{x| ab ＜x＜ a+b 2 }
C.
{x|b＜x＜ a+b 2 }
D.
{x|x＜ a+b 2 或x≥a}
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