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
The word suffocated ( sentence 4, para. 4) most probably means ______.
A．swept over
B．caused disaster to
C．made unable to breathe
D．blew away
单项选择题
Which of the following is NOT a cause of drought
A．Unwise fanning practices.
B．Fast evaporation of moistures.
C．Water shortages.
D．Rising up of temperature.
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