单项选择题

The fact that cotton prices were falling is mentioned by the author to show that（）

A．cotton shipments should have been adjusted
B．poorer soil produced poorer quality crops
C．the planters were having hard times
D．there were reasons why young people move westward

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单项选择题

Which of the following sentences can summarize the main idea of the passage（）

A．Hard times had come to South Carolina.
B．Planters found their expenses rising and their income reduced.
C．The soil was farmed by uneducated and careless slaves.
D．Year after year the soil of South Carolina had been planted with the same crop.

单项选择题

It has been proved all of the following except that（）

A．smiling does good to health
B．laughter can produce pain
C．there is a way to reduce pain
D．laughter can work the muscles in the feet