单项选择题

A．He has climbed mountains using a stick.
B．He has climbed mountains riding a home.
C．He has climbed mountains supported by a guider.
D．He has climbed mountains using a system be devised himsel
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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.
单项选择题
A．Insufficient housing.B．Lack of drinking water.C．Lack of food.D．Infectious diseas
A．Insufficient housing.
B．Lack of drinking water.
C．Lack of food.
D．Infectious diseas
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