单项选择题

The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）

A.Overhead power lines
B.Louisiana-Mississippi ferry crossings
C.Two railroad trestles
D.Two submerged oil pipelines

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The broken magenta line which runs parallel to the shorebetween Roanoke Point and Mattituck Inlet marks a（）.

A.fish trap area
B.pipeline
C.demarcation line
D.cable area

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The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.

A.cloud movement
B.vessel heading
C.waves
D.swells

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Steam smoke will occur when（）.

A.extremely cold air from shore passes over warmer water
B.warm dry air from shore passes over cooler water
C.cold ocean water evaporates into warm air
D.cool rain passes through a warm air mass