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 good swimmers along the beach.
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单项选择题
A．Relaxing at the seashore.B．Visiting her parents.C．Sailing on a boat.D．Preparing for a race.
A．Relaxing at the seashore.
B．Visiting her parents.
C．Sailing on a boat.
D．Preparing for a race.
单项选择题
A．The role of inland waterways in the nation’’s growth.B．The development of New York City as a seaport.C．The growth of the railroads.D．The disappearance of the canal system.
A．The role of inland waterways in the nation’’s growth.
B．The development of New York City as a seaport.
C．The growth of the railroads.
D．The disappearance of the canal system.
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