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was：were
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单项选择题
A．Insufficient housing.B．Lack of drinking water.C．Lack of food.D．Infectious disease.
A．Insufficient housing.
B．Lack of drinking water.
C．Lack of food.
D．Infectious disease.
单项选择题
A．You can grow vegetables vertically.B．You can raise plants in a confined area.C．You can plant a wide variety of plants together.D．You can make a lot of profit.
A．You can grow vegetables vertically.
B．You can raise plants in a confined area.
C．You can plant a wide variety of plants together.
D．You can make a lot of profit.
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