单项选择题
A.President George Washington B.President Theodore Roosevelt C.President Franklin Roosevelt D.President Ulysses S. Grant
Which of the following statements about Old Faithfulare...
多项选择题Which of the following statements about Old Faithfulare correct?（）
A.It’s the name of a geyser in Yellow Stone National Park. B.It’s named after a man who was faithful. C.It’s the first geyser receiving a name. D.It erupts at regular intervals of time.
What are the two reasons to shape the Grand Canyon?（）A....
多项选择题What are the two reasons to shape the Grand Canyon?（）
A.seismic upheaval B.earthquake C.glaciation D.grits in Colorado river
UNESCO designated Redwood National Park a world heritag...
判断题UNESCO designated Redwood National Park a world heritage site because of its rare ecosystem and cultural history.
