They are naturally equipped with 16 they need to groom themselves: a flexible tongue with which to lick, forepaws they moisten with saliva and use like washcloths, and teeth to dig out tougher pieces of food. 17, adult cats may spend as much as half of their waking hours grooming themselves, their relatives and friends.
答案：(B) Believe it or not
Believe it or not（信不信由你）符合這種帶出令人意外的事實（成貓花一半清醒時間理毛）的語氣；In a nutshell（簡言之）、On the other hand（另一方面）、To make matters worse（更糟的是）都不合。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
四個選項都是句首的轉承語，而這一段一直在講貓有多愛乾淨，To make matters worse（更糟的是）看起來像要接一個負面的轉折。這一格要看的是後面那個數字給人的感覺。
四個選項都是轉承語，可見這一格考的是這一句的語氣。先看後面接什麼：adult cats may spend as much as half of their waking hours grooming themselves, their relatives and friends.（成貓可能把清醒時間的一半用在替自己、親屬和朋友理毛上。）注意 as much as half（多達一半）——這是一個會讓人意外的比例，作者用它來讓讀者吃驚，所以前面要配一個「信不信由你」的說法，填 Believe it or not。
To make matters worse（更糟的是）：要求後面接的是一件壞事，但貓花很多時間理毛在這一段裡不是壞事，整篇是在稱讚貓愛乾淨。In a nutshell（簡言之）：用來把前面講過的東西收攏成一句，而這一句是新資訊、還在往下展開。On the other hand（另一方面）：要拿兩個相反的面向來比，本段沒有那個對照。
Believe it or not（信不信由你）、in a nutshell（簡言之）、to make matters worse（更糟的是）、as much as（多達）、waking hours（清醒的時間）、spend time V-ing（花時間做……）。
When it comes to personal hygiene, cats are the best example of cleanliness. They are naturally equipped with 16 they need to groom themselves: a flexible tongue with which to lick, forepaws they moisten with saliva and use like washcloths, and teeth to dig out tougher pieces of food. 17, adult cats may spend as much as half of their waking hours grooming themselves, their relatives and friends.
Mothers begin licking their kittens 18 birth---to clean them, stimulate the release of body waste, wake them up to suck milk, and provide comfort. Kittens usually begin grooming themselves when they are about four weeks old. 19 five weeks of age, kittens also begin grooming other baby cats, as well as their mom.
20 grooming among cats, called allogrooming, often continues into adulthood. Allogrooming is a social activity that serves to strengthen the bond between cats.