单项选择题

What did the expansion of fields in the First World War lead to

A．A serious drought.
B．A reduction in price.
C．Soaring wheat prices.
D．Extinction of rattlesnakes.
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单项选择题
Why did farms expand their fields during the First World War
A．Because they could obtain more profit.
B．Because there had been a serious drought which caused lack of food.
C．Because they wanted to find a solution to the natural disaster.
D．Because there had been a drought in the Midwest United States.
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