题目

In spite of the advanced medical technology, many Americans have no ________ to the good health care for poverty. A . access B . entrance C . introduction D . devotion 答案：A经过双曲线的左焦点F1作倾斜角为的弦AB．求：（1）线段AB的长；  （2）设F2为右焦点，求△F2AB的面积．