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If you are in the zoo, remember not to touch or go near the animals. Although some of the animals are cute, you _________ leave them alone.

   A. must   B. will   C. may   D. can

Yellowstone is a huge park covering over 3,400 square miles in Wyoming, Montana and Idaho. It can be reached by air to Cody or Jackson, 50 miles from the entrances(入口) . There is no train service nearby. Limited(有限的) bus service is used from some of the towns near it. Once in the area, a car is almost a must . The park has 5 entrances, which are open from May to October . It is a good idea to plan a trip during the good weather, but except big crowds and show traffic. Parts of the park are open in the winter for snow sports.

Be sure to come prepared for different weather at any time of the year. Take enough of your clothing so you will be prepared for unexpected changes in temperature. Take good walking shoes and thick socks, if you are going to do any hiking. You can also see the park on horseback.

If you want to learn about Yellowstone, the National Park Service has many talks, films and tours to help you to understand it .

1. How large is Yellowstone National Park ?

2. What is a must if you are in the area ?

3. Why are parts of the park open in winter ?

4. What do you need to take while going to do any hiking ?

5. Where can you find more information about Yellowstone ?