题目

No Car Day was started to protect the environment. It was first started by 34 cities in France on September 22, 1998. By now, more than 1,000 cities around the world have had a No Car Day.The first No Car Day in China was in Chengdu in 2001. Other cities, including Taipei, Shanghai, Nanjing, Hangzhou and Wuhan, also support the day.In Beijing, more and more people are joining in the activity. It asks drivers to leave their cars at home for one day each month and walk or ride a bike to work. It also calls on Beijingers not to use cars on June 5 (World Environment Day). So far more than 200,000 如果方程表示焦点在轴上的椭圆，则实数的取值范围是(    )A．B．C．或D．或