More often than not, those in their early twenties are the more 17 consumers.
答案：(A) informed
informed 當形容詞是「消息靈通的、掌握充分資訊的」，用來形容人；informed consumers 即「懂得做功課的消費者」。informative（提供豐富資訊的）用來形容書籍、演講等事物，informal（非正式的）、informational（資訊性的）語意都不合。
答對率 15%，鑑別度 0：高分群與低分群考生答對率幾乎一樣，代表大家都在猜。
inform 家族擠成一團，你記得 information、informative，卻很少把 informed 當形容詞記住。它的中文是「消息靈通的」，最接近的說法是「萬事通」——不是「包打聽」，愛探聽那個是 nosy。這一家不必一個一個背，先找到來源就好：inform（告知）→ informative 具備 inform 的特質，會給出資訊；informed 是被 inform 過的，接收了資訊。一個放出去、一個收進來。這個對立你國中就學過：interesting／interested、boring／bored——-ing 形容東西，-ed 形容人。這裡形容的是 consumers，所以只能是 informed。
線索在下一句：There isn't a brand or a trend that these young people are not aware of.（沒有哪個品牌或潮流是這些年輕人不知道的）——用雙重否定表達「什麼都知道」，正是 informed 的同義改寫。形容詞題不確定時，往下一句找作者有沒有換個說法再講一次。
informative（資訊豐富的）形容東西；informal（非正式的）；informational（資訊性的）。三個都不能形容「懂得做功課的人」。反義走字首 un-：uninformed（沒做功課的）。這個家族一句記完：An informative news app keeps readers informed, so they can form an informed opinion instead of an uninformed guess.（資訊充足的新聞 app 讓讀者隨時掌握狀況，於是他們形成得了有依據的看法，而不是沒做功課的瞎猜。）〔情境取材自 108 指考作文題：青年對各類新聞的關注度〕再往外兩個字：informer（線民，祕密向警方提供消息的人）與 informant（提供資訊者，語氣中性），超出高中範圍，當延伸看。
an informed consumer（懂得做功課的消費者）、an informed decision（明智的決定）、well-informed（消息靈通的）、keep sb informed（隨時告知某人）、an informative talk（資訊豐富的演講）、be aware of（意識到）、keep abreast of（跟上…的最新狀況）。
Anita was shopping with her mother and enjoying it. Interestingly, both of them 16 buying the same pair of jeans. According to a recent marketing study, young adults influence 88% of household clothing purchases. More often than not, those in their early twenties are the more 17 consumers. There isn't a brand or a trend that these young people are not aware of. That is why mothers who want to keep abreast of trends usually 18 the experts－their daughters. This tells the retailers of the world that if you want to get into a mother's 19 , you've got to win her daughter over first.
With a DJ playing various kinds of music rather than just rap, and a mix of clothing labels designed more for taste and fashion than for a precise age, department stores have managed to appeal to successful middle-aged women 20 losing their younger customers. They have created a shopping environment where the needs of both mother and daughter are satisfied.