beautiful natural scenery of Ireland attracts millions of tourists every year and tourism is now big industry.
A. The; the
B. A; the
C. A; a
D. The; a
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A. The; the
B. A; the
C. A; a
(答案→)D. The; a
解析：考查冠词。The beautiful natural scenery of Ireland为特指爱尔兰美丽的自然风光，a big industry一大产业，故选D。