单项选择题

A．He has climbed mountains using a stick.
B．He has climbed mountains riding a horse.
C．He has climbed mountains supported by a guider.
D．He has climbed mountains using a system he devised himself.
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单项选择题
A．Sunlight.B．Location.C．Soil.D．Good drainage.
A．Sunlight.
B．Location.
C．Soil.
D．Good drainage.
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.
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