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【题目】It's said that about one _________ (five) of the teenagers around the world have mental health problems.

【答案】fifth

【解析】

句意:据说全世界大约五分之一的青少年有心理问题。

根据分数的表达方式,分子用基数词,分母用序数词,分子超过一时,分母加s,这里分子是one,所以分母不用加s;故填fifth

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