單數名詞是與時間、價值、長度有關的數值
a book which is one hundred dollars → a hundred-dollar book 一本一百元的書a girl who is five years old → a five-year-old girl 一個五歲的女孩a vacation which is two weeks long → a two-week vacation 兩週的假期
a book which is one hundred dollars → a hundred-dollar book 一本一百元的書
a girl who is five years old → a five-year-old girl 一個五歲的女孩
a vacation which is two weeks long → a two-week vacation 兩週的假期
45. There will be a ___ soon and everyon..-阿摩線上測驗