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.
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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.
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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