He asserted that nuclear power was a safe
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He asserted that nuclear power was a safe and non-polluting energy source.
A:maintained B:recommended C:considered D:acknowledged
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答案：A
题干意为“他断言核能是一种安全而又无污染的能源。” 句中划线词意为“主张，断言”。A项maintain意为“主张，强调”；例句：He maintains that there are no short cuts to effective management．他断言，有效的管理没有捷径可走。B项意为“推荐”。C项意为“考虑”。D项意为“承认”。故选A。