（Ⅰ）求f（x）的值域；

（Ⅱ）设△ABC的内角A、B、C所对的边分别为a、b、c，已知A为锐角，f（A）= $\frac{\sqrt{3}}{2}$ ，b=2，c=3，求cos（A﹣B）的值．

阅读短文，回答问题。

    It's eight o'clock. The children go to school by car every day. But they are walking to school today. It's ten o'clock. Mrs. Green usually(通常) stays at home in the morning. But she is going to the shops this morning. It's nine o'clock. Mr. Green usually reads his newspaper at night(晚上). But he is reading an interesting(有趣的) book this evening.

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下图为“北半球中纬度某地某日5次观测到的近地面气温垂直分布示意图”。当日天气晴朗，日出时间为5时。由图中信息可分析出(　　)

①防止和消除社会腐败行为     ②建设社会主义法治国家

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