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In the 19th century Americans from the eastern states moved into the west to settle down in the rich new lands along the Pacific Coast. The most difficult part of their trip was crossing the “ Great American Desert ” in the western part of the United States by horse and carriages.
1．In the 19th century, Americans moved from the east to the west because they _____ .
A．enjoyed the trip B．wanted to make their home there
C．wanted to see the beauty of the west D．thought the west was fertile
请问:为什么选B而不选D？
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