单项选择题
Who signed the bill to establish Yosemite National Park?（）
A.President George Washington B.President Theodore Roosevelt C.President Franklin Roosevelt D.President Ulysses S. Grant
多项选择题 Which of the following statements about Old Faithfulare correct?（）
多项选择题 What are the two reasons to shape the Grand Canyon?（）
判断题 UNESCO designated Redwood National Park a world heritage site because of its rare ecosystem and cultural history.
