题目

TOKYO – The number of domestic infections cases of influenza A/H1N1 in Japan hits 42 on Sunday after a total of 34 people in Osaka and Hyogo counties were confirmed to have been infected, local media reported. The total number of the infection in the country now stands at 46, including the first four cases contracted abroad. The country is now facing the risk of grass-root outbreak which could lead the WHO to raise its new flu pandemic alert（传染病预警）to the highest level of 6 from the current 5, experts has warned. The 34 newly confirmed domestic cases, 11 in Osaka and 23 in Hy 在椭圆中，分别是其左右焦点，若，则该椭圆离心率的取值范围是              （    ）     A．   B．  C．   D．