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.
单项选择题
A．By talking to an expert.B．By reading an article.C．By attending an exercise class.D．By listening to the radio.
A．By talking to an expert.
B．By reading an article.
C．By attending an exercise class.
D．By listening to the radio.
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