朗阁海外考试研究中心的雅思培训老师为考生带来2015年9月的真题回顾，此为雅思阅读真题回顾部分。
Reading Passage:
Hearing impairment or other auditory function deficit in young children can have a major impact on their development of speech and communication, resulting in a detrimental effect on their ability to learn at school. This is likely to have major consequences for the individual and the population as a whole. The New Zealand Ministry of Health has found from research carried out over two decades that 6-10% of children in that country are affected by hearing loss.
Question:
Choose NO MORE THAN TWO WORDS AND / OR A NUMBER from the passage for each answer.
For what period of time has hearing loss in schoolchildren been studied in New Zealand?
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雅思9月考题真题回顾答案：
阅读：two decades
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