单选题 Just last week, for example, the World Heahh Organization (WHO) announced the disturbing disclosure that chick flu may be pretty deadlier than previously believed.
【正确答案】 B
【答案解析】[解析] 本题考查副词应用。pretty在这里为副词，意为“相当”，修饰形容词比较级deadlier；用来修饰比较级的副词有far，much等，而very，especially只能修饰形容词原级。所以，答案是B。