单项选择题

Crops grew smaller in production in South Carolina mainly because（）

A．demand for cotton had decreased
B．crops became varied
C．planters grew richer
D．soil was less productive

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单项选择题

According to the passage, which of the following showed the expenses of planters were rising（）

A．Planters had to buy more machines.
B．The land in the west became more expensive than before.
C．Planters had to pay more money to ship cotton.
D．Planters needed more and more slaves.

单项选择题

According to the passage, the reason why many younger people moved westward is（）

A．the climate in the western area is good to raise cotton.
B．they were unsatisfied with their life in the south.
C．they knew little about soil conservation.
D．there were many factories in the west.