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.
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单项选择题
A．Courses for lawyers.B．Courses for doctors.C．Courses for reporters.D．Courses for businessmen.
A．Courses for lawyers.
B．Courses for doctors.
C．Courses for reporters.
D．Courses for businessmen.
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quality
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