But after strike four, Sullivan became 23 death and took precautions during lightning strikes.
答案：(A) fearful of
【句型】fearful of 字詞搭配「害怕」，表示蘇利文變得害怕死亡並開始採取預防措施；critical of（批評）、doubtful about（懷疑）、positive about（對……正面，語意不合）都不合。
四個選項都是「形容詞＋介系詞」。這種題型的第一步通常是先檢查介系詞對不對，但這一題比較特別——fearful of、critical of、doubtful about、positive about 四組搭配本身都成立，一個都刪不掉，只能純比語意。
看後半句：and took precautions during lightning strikes（並且在打雷時採取預防措施）。會採取預防措施，是因為害怕。 再看前一句 Strikes one, two, and three were pure bad luck, he thought（前三次他覺得純屬倒楣）——「本來以為只是運氣不好，第四次之後就……」，這個轉折需要一個心態變化，從不在意變成害怕。
critical of death（批評死亡）語意不通，死亡不是可以批評的對象；doubtful about death（懷疑死亡）同樣說不通；positive about death（對死亡持正面態度）與「採取預防措施」直接矛盾——真的看得開就不必防了。
be fearful of（害怕……）、fear for sb's safety（擔心某人的安全）、be critical of（批評……）、be doubtful about（對……存疑）、be positive about（對……樂觀）、take precautions（採取預防措施）。
Being hit by lightning is a rare event. Over the course of an 80-year life span, the odds of being hit by lightning are 1 in 3,000, 21 the probability of being struck seven different times. Roy Sullivan, a park ranger in the United States, was struck by lightning more recorded times than any other human being. Over his 36-year career, Sullivan was struck by lightning seven times—and 22 each shock!
Strikes one, two, and three were pure bad luck, he thought. But after strike four, Sullivan became 23 death and took precautions during lightning strikes. Strike five occurred in 1973 when Sullivan was on patrol. A storm cloud "chased" him until he was struck. The same thing happened again in 1976. Sullivan, while surveying a campground, felt that a cloud was 24 him, and tried all he could to run— but it got him anyway.
Finally, on 25 June 1977, a seventh and final bolt struck Sullivan as he was fishing in a pond. "I don't believe God is after me," he theorized. "If he was, the first bolt 25 enough. Best I can figure is that I have some chemical, some mineral, in my body that draws lightning. I just wish I knew."