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（5分）（2011?陕西）（请在下列三题中任选一题作答，如果多做，则按所做的第一题评分） A．（不等式选做题）若不等式|x+1|+|x﹣2|≥a对任意x∈R恒成立，则a的取值范围是 ． B．（几何证明选做题）如图，∠B=∠D，AE⊥BC，∠ACD=90°，且AB=6，AC=4，AD=12，则AE= ． C．（坐标系与参数方程选做题）直角坐标系xoy中，以原点为极点，x轴的正半轴为极轴建极坐标系，设点A，B分别在曲线C 1 ： （θ为参数）和曲线C 2 ：p=1上，则|AB|的最小值为 ．
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Before rates were permitted to float
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commercial, political and foreign exchange risks.
C.
so marketers must be prepared to assume them or give up doing business in a particular market
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the number of places that the hurricane hit
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