<span>B.leave land unplanted to gather moisture
This is the traditional practice. Today, dry planting techniques include mulching after a short rain,which stops moistures from evaporating. dry planting produces are very delicious,especially wines.
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I think it might be either wind power or hydro electric, but because new zeland has many rivers and reservoirs, i think it might be hydro electric power.
The answer is b EU created a free trade agreement