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

【答案】fifth

【解析】

句意:據(jù)說(shuō)全世界大約五分之一的青少年有心理問(wèn)題。

根據(jù)分?jǐn)?shù)的表達(dá)方式,分子用基數(shù)詞,分母用序數(shù)詞,分子超過(guò)一時(shí),分母加s,這里分子是one,所以分母不用加s;故填fifth。

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