Note, however, that rarity has little to do with the 22 of a coin.
答案：(A) age
語意「稀有性跟硬幣的『年代』關係不大」，age（年代）符合，呼應後文舉例「許多千年古幣只值幾塊錢」；shape（形狀）、size（大小）、weight（重量）都不合。
age 在你腦中幾乎等於「年齡」，是用在人身上的字。要它去講一枚硬幣，會覺得怪怪的，於是改挑 size 或 weight 這些看得見的物理特徵。
age 除了人的年齡，也用來指東西的「年代、有多老」——the age of the building（這棟建築的年代）、a tree's age（一棵樹的樹齡）。這是同一個字的自然延伸，不是什麼特殊用法。真正的依據在下一句，出題者已經把答案寫出來了：Many thousand-year-old coins often sell for no more than a few dollars（許多千年古幣往往只賣得了幾塊錢）。thousand-year-old 講的就是年代。這句話在說「很老不等於很值錢」，正好呼應本句的「稀有度與硬幣的 ______ 關係不大」。把四個選項代回去，問哪一個能被下一句支持：形狀、大小、重量在整段裡從頭到尾沒被提過，只有年代被舉例說明。空格填什麼，看後面舉的是什麼例子，這是克漏字很穩的解法。
shape（形狀）：整段沒有提過任何硬幣的形狀，下一句的例子也接不上。size（大小）：同樣沒有被提及；而且下一句舉的是年份，不是尺寸。weight（重量）：三個之中最像收藏品會在意的特徵，但文章講的是含金量以外的價值判準，通篇未提重量。克漏字的空格不能只看「講不講得通」，要看「後面有沒有東西接得上」。
have little to do with（與…關係不大）、thousand-year-old（有千年歷史的）、the age of（…的年代）、date from（追溯自…）、for ages（很久）、come of age（成年、成熟）。
For coin collectors who invest money in coins, the value of a coin is determined by various factors. First, scarcity is a major determinant. 21 a coin is, the more it is worth. Note, however, that rarity has little to do with the 22 of a coin. Many thousand-year-old coins often sell for no more than a few dollars because there are a lot of them around, 23 a 1913 Liberty Head Nickel may sell for over one million US dollars because there are only five in existence.
Furthermore, the demand for a particular coin will also 24 influence coin values. Some coins may command higher prices because they are more popular with collectors. For example, a 1798 dime is much rarer than a 1916 dime, but the 25 sells for significantly more, simply because many more people collect early 20th century dimes than dimes from the 1700s.