设全集为R,集合 A = x 0 < x < 2 , B = x x ≥ 1 ,则 A ∩ ( ∁ R B ) = ( )
x 0 < x ≤ 1
x 0 < x < 1
x 1 ≤ x < 2
x 0 < x < 2
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