单项选择题

Passage One

A．To transport water to higher place.
B．To transport vegetables quickly.
C．To bring nutrients to the soil.
D．To adjust the soil temperature.
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单项选择题
A．More than 12.B．12.C．100.D．Not mentioned.
A．More than 12.
B．12.
C．100.
D．Not mentioned.
单项选择题
C
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