单项选择题

"It" in the first sentence of this passage refers to ______.

A．drought
B．moisture
C．evaporation
D．rain
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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.
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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