单项选择题

A．High altitude.
B．The cold weather.
C．Mild exercises.
D．The food.
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单项选择题
A．Research methods and lines of approach.B．Aims and objectives.C．Key problems and research questions.D．Works consulted and cited.
A．Research methods and lines of approach.
B．Aims and objectives.
C．Key problems and research questions.
D．Works consulted and cited.
单项选择题
A．Warm and humid.B．Cold and humid.C．Warm and dry.D．Cold and dry.
A．Warm and humid.
B．Cold and humid.
C．Warm and dry.
D．Cold and dry.
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