单项选择题

A．means
B．pattern
C．approach
D．technique
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单项选择题
A．outcomeB．eventC．circumstanceD．environment
A．outcome
B．event
C．circumstance
D．environment
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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