He asserted that nuclear power was a safe and non-polluting energy source.（）A.ma

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问题 He asserted that nuclear power was a safe and non-polluting energy source.（）

选项 A.maintained
B.recommended
C.considered
D.acknowledged

答案A

解析本题是对动词的考查。题干：他断言核能量是一种安全无污染的能源。题干划线词assert意为“断言，主张”。四个选项：maintain意为“维修，维持，断言”，recommend 意为“推荐，建议”，consider意为“考虑，认为”，acknowledge意为“承认，公认”，故本题正确答案为A。

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