The picture 22 have been used in Canada for the last four years.
答案：(B) warnings
The picture warnings（圖片警示）作為複合名詞主詞，have been used（過去四年來一直被使用）呼應複數動詞；symbols／commercials／decorations 都不符合前文一直在講「警示圖片」的語境。
The picture ___ 這個位置很容易被讀成「圖片的某某」，四個名詞塞進去都通順，只好用猜的。其實本篇後段就把答案寫出來給你看了。
兩個名詞並排時，前面那個當形容詞用，後面那個才是真正在講的東西（picture warnings ＝ 用圖片做的警示）。四個選項都是複數名詞，都與 have been used 相配，形態上分不出高下，可見這一格考的是語意，只能往上下文找。決定性的一句在同一篇後段：At the moment EU tobacco manufacturers only have to put written health warnings on cigarette packets（目前只被要求放文字的健康警語）——written（文字的）對 picture（圖片的），共用同一個名詞 warnings，全篇就是在對比「文字警語」與「圖片警語」。再往前一句看，reminders in large print that smokers die younger（以大字提醒吸菸者較早死）也是同一件事的同義說法。這一題的鑑別度 58，分的正是有沒有把這兩處線索讀進來。
symbols（符號）：菸盒上放的是照片，不是符號，而且符號不會有「駭人」的效果。commercials（電視廣告）：方向完全相反，本篇要的是勸人別抽菸，不是替菸商打廣告。decorations（裝飾）：菸盒上印受損的肺不是為了好看。
warn sb of／about sth（警告某人某事）、warn sb (not) to V（警告某人（不要）做某事）、a health warning（健康警語）、a warning label（警示標籤）、a warning sign（警示標誌）、without warning（毫無預警地）。
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.