单选题
He asserted that nuclear power was a safe and non一polluting energy source.
Amaintained
Brecommended
Cconsidered
Dacknowledged
正确答案
答案解析
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。