题目

 The government work report by Premier Wen covers a variety of issues, and the prices of agricultural products ______.   A. in common        B. in general         C. in particular     D. in practice 答案：C10．已知椭圆$\frac{{x}^{2}}{{a}^{2}}$$+\frac{{y}^{2}}{{b}^{2}}$=1的短轴的一个端点B与两焦点F1，F2组成三角形的周长为8+8$\sqrt{2}$，且F1B⊥F2B，求椭圆方程．