单项选择题

A．Exploration.
B．Increase oil production.
C．Alternative sources of energy.
D．Not of above all.
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单项选择题
A．To other European countries.B．To the remote areas and suburbs.C．To the natural parks for birds.D．Back to their nests.
A．To other European countries.
B．To the remote areas and suburbs.
C．To the natural parks for birds.
D．Back to their nests.
单项选择题
A．To transport water to higher place.B．To transport vegetables quickly.C．To bring nutrients to the soil.D．To adjust the soil temperatur
A．To transport water to higher place.
B．To transport vegetables quickly.
C．To bring nutrients to the soil.
D．To adjust the soil temperatur
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