These photos will show 21 smoking damages your health.
答案：(B) how
語意「這些照片將展示吸菸如何危害你的健康」，how（如何）符合；when（何時）、where（哪裡）、what（不能這樣接完整子句表達「如何」）都不合。
what 是最常用的疑問詞，看到 show 後面要接東西，很容易直覺就填 what。這一題要靠「數子句成分」才定得了案（同判準：97 年第 27 題、98 年第 23 題、105 年第 21 題、95 年第 24 題）。
四個選項都是 wh- 詞，可見這一格考的是 show 後面那個子句要用哪一個字引導。這種擺在動詞後面、由 wh- 詞帶頭的子句，就是國中教過的間接問句，掛鉤是 Tell me how to get there.（告訴我怎麼去那裡。）與 Can you tell me how much it costs?（可以告訴我多少錢嗎？）。間接問句有兩個看得見的特徵，本句全中：語序回到直述句的「主詞＋動詞」，而且不借助 do／does／did（英國文化協會 LearnEnglish 的 question words 說明）。還原成直接問句就一目了然：How does smoking damage your health?（吸菸如何危害你的健康？）改成間接問句時 does 消失、damage 補回第三人稱單數的 -s，就成了 how smoking damages your health。認出這一點，成分也就順手數清楚了：smoking（主詞）、damages（動詞）、your health（受詞），一個都不缺。what 自己要在子句裡當主詞或受詞，成分既然已經滿了就沒有它的位置，先刷掉。剩下 when、where、how 三個都是副詞性的，不占句子成分，這時才輪到語意：下一句 The shocking pictures include images of smoke-damaged lungs and teeth（受損的肺與牙齒的影像）講的是「傷害長什麼樣子、怎麼造成的」，不是時間也不是地點，所以填 how。
what：成分已滿，塞不進去。when（何時）、where（何處）：文法上都放得進去，但整段沒有任何時間或地點的線索在支撐它們。
那一格是關係子句，這一格是間接問句，分辨方法只有一句話：看 wh- 詞前面接的是名詞還是動詞。前面是名詞（His father, who ...），wh- 詞回頭補充說明那個名詞，是關係子句；前面是動詞（show ...），wh- 詞帶著整個子句去當那個動詞的受詞，是間接問句。
show／tell sb how to V（告訴某人怎麼做）、damage one's health（損害健康）、be bad for one's health（對健康有害）、in large print（以大字體印刷）、die young（早逝）、smoke-damaged（因吸菸而受損的）。
European politicians are trying to get the UK Government to make cigarette companies print photos on the packets. These photos will show 21 smoking damages your health. The shocking pictures include images of smoke-damaged lungs and teeth, with reminders in large print that smokers die younger.
The picture 22 have been used in Canada for the last four years. It has been very successful and has led to a 44 23 in smokers wanting to kick the habit. At the moment EU tobacco manufacturers only have to put written health warnings on cigarette packets 24 the dangers of smoking.
The aim of the campaign is to remind people of the damage the deadly weed does to their body. It is believed that this would be to the best interest of all people, 25 teens who might be tempted to start smoking. These dreadful photos may change the impression among teenagers that smoking is cool and sexy.