单项选择题

Sine the 1960s,（）has become the mainstay of the Irish economy.

A.manufacturing　
B.mining
C.energy　
D.animal husbandry

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单项选择题
In Ireland the agricultural enterprise producing the most income is（）.

A.forestry　
B.vegetable growing
C.sugar refining　
D.animal husbandry
单项选择题
The economy of Ireland has been traditionally agricultural,but since （）country.sindustrial base has expanded.

A.the mid-1950s　
B.the mid-1960s
C.the 1970s　
D.the 1980s
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