（Ⅰ）求B；

（Ⅱ）若c=2，b=3，求△ABC的面积．

    This is a photo of Mr Black's family. The man with glasses（眼镜）is Mr Black, the father. The woman is the mother. They have a son and a daughter. The son is behind（在……后面）Mr Black. His name is Jack. He's 14. Kate is Jack's sister. She is 12. Jack and Kate are in the same school, but they are in different（不同的）grades. Jack is in Grade Three and Kate's in Grade One. They are good students.

将人类的红细胞置于不同浓度的蔗糖溶液中，浸泡半小时之后的结果如图，依照细胞外形的变化判断蔗糖溶液的浓度，由高到低排列，正确的是（  ）

如图所示，每一个企业的文化建设都可以由内到外，从最核心的精神文化做起，直至最表层的物质文化，把企业文化建设落到实处，抓出成效，这是因为（    ）

①文化与经济相互交融             ②文化推动企业发展

③文化影响企业的核心竞争力 ④一定的文化是对经济的反映