单项选择题

A．To fly one following another.
B．To fly without stopping.
C．To use land features as the guide.
D．To take one route only.
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单项选择题
A．Its variety of colors.B．Its unusual texture.C．The way it is sold.D．Its main ingredient.
A．Its variety of colors.
B．Its unusual texture.
C．The way it is sold.
D．Its main ingredient.
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