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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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
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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