单选题 Just last week, for example, the World Health Organization (WHO) announced the disturbing disclosure that chick flu may be {{U}}pretty{{/U}} deadlier than previously believed.
【正确答案】 B
【答案解析】[分析]副词应用 用来修饰比较级的副词应用far，much等，而very，especially只能修饰原级；因此答案为B。