单项选择题

A．Hurricanes.
B．Cloud.
C．Frog.
D．Snow.
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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．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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