[单项选择]Legend has it that sometime toward the Civil War (1861 -1865) a government train carrying oxen traveling through the northern plains of eastern Wyoming was caught in a snowstorm and had to be abandoned. The driver returned the next spring to see what had become of his cargo. Instead of the skeletons he had expected to find, he saw his oxen, living, fat, and healthy. How had they survived
The answer lay in a resource that unknowing Americans had trampled underfoot in their haste to cross the "Great American Desert" to reach lands that sometimes proved barren. In the eastern parts of the United States, the preferred grass for forage was as cultivated plant. It grew well with enough rain, then when cut and stored it would cure and become nourishing hay for winter feed. But in the dry grazing lands of the west, that familiar bluejoint grass was often killed by drought. To raise cattle out there seemed risky or even hopeless.
Who could imagine a fairy-tale grass that requir
A. continually moving from one grazing area to another
B. naturally fertilizing the soil
C. eating only quantities of grass
D. stepping on and pressing the seeds into the ground

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[单项选择]Legend has it that sometime toward the Civil War (1861 -1865) a government train carrying oxen traveling through the northern plains of eastern Wyoming was caught in a snowstorm and had to be abandoned. The driver returned the next spring to see what had become of his cargo. Instead of the skeletons he had expected to find, he saw his oxen, living, fat, and healthy. How had they survived
The answer lay in a resource that unknowing Americans had trampled underfoot in their haste to cross the "Great American Desert" to reach lands that sometimes proved barren. In the eastern parts of the United States, the preferred grass for forage was as cultivated plant. It grew well with enough rain, then when cut and stored it would cure and become nourishing hay for winter feed. But in the dry grazing lands of the west, that familiar bluejoint grass was often killed by drought. To raise cattle out there seemed risky or even hopeless.
Who could imagine a fairy-tale grass that requir
A. Western migration after the Civil War.
B. The raising of cattle.
C. A type of wild vegetation.
D. The climate of the western United States.

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[单项选择]War, chiefly the Civil War, in U. S. history has been a vital force in the rise of industrial capitalism, in the change of America from a dominantly agrarian and （　） country to one chiefly manufacturing in nature.
A. cosmopolitan
B. predatory
C. pastoral
D. proletarian

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[单项选择]How long has the civil war been going on for
A．Almost one year. B．Just over a year.
C．A year and half. D．Two years.

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American civil war

Historians of the war can be divided into two schools. The first considers that it was the unavoidable outcome of conflicting (51) between Northern and Southern (52) . The second blames it (53) political leaders for (54) to avert an unnecessary war.A. longed B. looked C. sought D. chased

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