单项选择题

A．taking further photos
B．taking soil samples
C．planting vegetation in the soil
D．taking samples of vegetation
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单项选择题
A．longest defended borderB．longest undefended borderC．longest undefined borderD．longest coastal border
A．longest defended border
B．longest undefended border
C．longest undefined border
D．longest coastal border
填空题
film→filming
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