He asserted that nuclear power was a safe
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He asserted that nuclear power was a safe and non一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maintained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项。