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Questions 1 through 3 are based on the following passage.
1. A. To determine the position of a ship.
B. To find the direction of a current.
C. To predict the direction of a ship.
D. To carry messages across the ocean.
2. A. US ships were longer than British ones.
B. British ships could sail the Atlantic faster than US ones.
C. US ships could sail the Atlantic faster than British ones.
D. US captains knew more about maps.
3. A. He compared his own map with other maps.
B. He talked with many British sea captains.
C. He used drifting ships to check his map.
D. He drew maps of currents and checked them.
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