单项选择题
Industrial output has grown by an average of（）annually since tariff barriers were eliminated in 1977.
A.3%
B.5%
C.8%
D.10%
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Sine the 1960s,（）has become the mainstay of the Irish economy.
A.manufacturing
B.mining
C.energy
D.animal husbandry -
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In Ireland the agricultural enterprise producing the most income is（）.
A.forestry
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C.sugar refining
D.animal husbandry -
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The economy of Ireland has been traditionally agricultural,but since （）country.sindustrial base has expanded.
A.the mid-1950s
B.the mid-1960s
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D.the 1980s
