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economy
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单项选择题
A．They are not competing with each other.B．They have to pay a high fee.C．They tend to be beginning cyclists.D．Most of them fail to finish the route.
A．They are not competing with each other.
B．They have to pay a high fee.
C．They tend to be beginning cyclists.
D．Most of them fail to finish the route.
单项选择题
A．To transport water to higher elevations.B．To provide air-conditioning.C．To bring nutrients to the soil.D．To adjust the soil temperature.
A．To transport water to higher elevations.
B．To provide air-conditioning.
C．To bring nutrients to the soil.
D．To adjust the soil temperature.
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