![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
[主观题]
Which of the following statements about uniformed rangers is true?() A.They t
Which of the following statements about uniformed rangers is true?()
A.They take tourists to parks.
B.They are professors of history.
C.They set up new national parks.
D.They protect the National Park System.
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)