单项选择题A.Enforcing laws controlling navigation, shipping, immigration and fishing.B.Enforcing laws affecting the privately-owned boats in the U. S.C.Searching for missing boats and rescuing people.D.Training people to be good swimmers along the beach.
A.Enforcing laws controlling navigation, shipping, immigration and fishing.
B.Enforcing laws affecting the privately-owned boats in the U. S.
C.Searching for missing boats and rescuing people.
D.Training people to be good swimmers along the beach.