题目

______ the growing number of patients, the clinic had to extend its service from five days to seven days a week. A. To accommodate        B. Accommodating C. Being accommodated       D. Accommodated 答案：A 解析: 略如图，F1和F2分别是双曲线的两个焦点，A和B是以O为圆心，以|OF1|为半径的圆与该双曲线左支的两个交点，且△F2AB是等边三角形，则双曲线的离心率为    ．