题目

阅读理解，阅读下列内容，从每小题所给的A、B、C、D四个选项中选出一个最佳答案。 Galloway Wildlife Conservation Park is in the south of Scotland. A collection of nearly 150 different animals from all over the world can be seen within the peaceful and natural setting. Galloway Wildlife Conservation Park is to provide a living shelter for small animals, to protect wildlife, to provide chances for the public to enjoy and learn about the area they live in. A main aim of the park is to protect endangered animals. Facilities(设施) available to visitors mainly i17．求函数y=$\frac{3}{（2+cosx）（5-cosx）}$的定义域．