单项选择题

A．The inner bark of a mulberry tree and wool.
B．Wool and bamboo.
C．Wood and bamboo.
D．Grass and wood.
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单项选择题
A．High altitude.B．The cold weather.C．Mild exercises.D．The food.
A．High altitude.
B．The cold weather.
C．Mild exercises.
D．The food.
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.
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