The report goes on to make a number of recommendations to improve______ (safe) o

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问题 The report goes on to make a number of recommendations to improve______ (safe) on aircraft.

选项

答案 safety

解析本题考查形容词转化为名词。safe(a．)的名词形式是safety，解释为“安全；安全设施”，safety多用作不可数名词，常用于in safety(安全地)或with safety(安全地)等短语中，另外safety belt解释为“安全带”。

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