Directions: Read the following text. Choose the best word
The outbreak of swine flu that was first detected in Mexico was declared a global epidemic on June 11, 2009. It is the first worldwide epidemic ___1___ by the World Health Organization in 41 years.
The heightened alert ___2___ an emergency meeting with flu experts in Geneva that assembled after a sharp rise in cases in Australia, and rising ___3___ in Britain, Japan, Chile and elsewhere.
But the epidemic is "___4___" in severity, according to Margaret Chan, the organization's director general, ___5___ the overwhelming majority of patients experiencing only mild symptoms and a full recovery, often in the ___6___ of any medical treatment.
The outbreak came to global ___7___ in late April 2009, when Mexican authorities noted an unusually large number of hospitalizations and deaths ___8___ healthy adults. As much of Mexico City shut down at the height of a panic, cases began to ___9___ in New York City, the southwestern United States and around the world.
In the United States, new cases seemed to fade ___10___ warmer weather arrived. But in late September 2009, officials reported there was ___11___ flu activity in almost every state and that virtually all the ___12___ tested are the new swine flu, also known as (A) H1N1, not seasonal flu. In the U.S., it has ___13___ more than one million people, and caused more than 600 deaths and more than 6,000 hospitalizations.
Federal health officials ___14___ Tamiflu for children from the national stockpile and began ___15___ orders from the states for the new swine flu vaccine. The new vaccine, which is different from the annual flu vaccine, is ___16___ ahead of expectations. More than three million doses were to be made available in early October 2009, though most of those ___17___ doses were of the FluMist nasal spray type, which is not ___18___ for pregnant women, people over 50 or those with breathing difficulties, heart disease or several other ___19___. But it was still possible to vaccinate people in other high-risk groups: health care workers, people ___20___ infants and healthy young people.
解析空格作后置定语修饰 epidemic，需过去分词，意为“由世卫组织（正式）认定/命名的”。designate 意为正式指定、定名，与官方宣布全球疫情的语境吻合；criticized（批评）、commented（评论）、appointed（任命人，不用于事件）均不合句意。故选 D designated。
2.
A) proceeded
B) activated
C) followed
D) prompted
答案 C
解析主语是 alert（警戒级别），宾语是 meeting，需及物动词。从时间线看：澳大利亚病例激增 → 日内瓦召开流感专家紧急会议 → WHO 随后提升警戒级别，即「高度警戒是在紧急会议之后」。followed 意为「紧随其后、继…之后发生」，主语 alert 在时间上后于宾语 meeting，逻辑通顺。prompted（引发、促使）表因果关系（alert 引发了 meeting），与事实顺序颠倒；proceeded 为不及物动词；activated（激活）搭配不当。故选 C followed。
3.
A) digits
B) numbers
C) amounts
D) sums
答案 B
解析与前文 a sharp rise in cases 并列，rising ___ 指（病例）数量上升。rising numbers 为地道搭配，表示数量增多；digits 指阿拉伯数码、amounts 用于不可数量、sums 指金额，均与“病例数”不符。故选 B numbers。
4.
A) moderate
B) normal
C) unusual
D) extreme
答案 A
解析引号内形容词作表语，与下文“绝大多数患者只有轻症、可完全康复”呼应，描述疫情严重程度“温和/中等”。moderate（适中、温和）契合；normal（正常）、unusual（反常）、extreme（极端）均与“轻症康复”的描述逻辑矛盾。故选 A moderate。
5.
A) with
B) in
C) from
D) by
答案 A
解析此处为 with + 名词 + doing 的独立主格结构（with the overwhelming majority of patients experiencing...），表伴随情况，意为“随着绝大多数患者只出现轻症”。in、from、by 均无法引导这种带现在分词的独立结构。故选 A with。
6.
A) progress
B) absence
C) presence
D) favor
答案 B
解析in the absence of 为固定搭配，意为“在缺乏…的情况下”，与 often 呼应，表多数人无需任何医疗即可康复。presence（在场）逻辑相反；progress（进展）、favor（偏爱）与 of any medical treatment 不搭。故选 B absence。
7.
A) reality
B) phenomenon
C) concept
D) notice
答案 D
解析came to global notice 为固定搭配，意为“引起全球关注”。reality（现实）、phenomenon（现象）、concept（概念）与 came to ... 搭配后均不能表达“被注意到”之意。故选 D notice。
8.
A) over
B) for
C) among
D) to
答案 C
解析deaths ___ healthy adults 表“健康成年人当中的死亡病例”，among 表示在某一人群范围之内。over、for、to 均不能表达“在…群体当中”的范围义。故选 C among。
9.
A) stay up
B) crop up
C) fill up
D) cover up
答案 B
解析主语是 cases，意为病例“开始接连冒出”。crop up 指（问题/事件）突然出现、不断涌现，与疫情扩散语境吻合；stay up（熬夜）、fill up（填满）、cover up（掩盖）均不合句意。故选 B crop up。
10.
A) as
B) if
C) unless
D) until
答案 A
解析“新增病例随着天气转暖而逐渐消退”，as 引导时间状语从句表“随着、当…时”，体现两件事同步推进。if（假设）、unless（除非）、until（直到）均与“随天气变化而消退”的伴随逻辑不符。故选 A as。
11.
A) excessive
B) enormous
C) significant
D) magnificent
答案 C
解析形容词修饰 flu activity，与 in almost every state（几乎每个州）呼应，意为“显著的流感活动”。significant（显著的）程度恰当；excessive（过度的）、enormous（巨大的）程度过强且不搭 activity，magnificent（壮丽的）语义完全不符。故选 C significant。
12.
A) categories
B) examples
C) patterns
D) samples
答案 D
解析all the ___ tested 意为“所有受检的样本”，且后文说这些都是新型猪流感病毒。samples（样本）能与 tested（检测）搭配；categories（类别）、examples（例子）、patterns（模式）均不能“被检测”。故选 D samples。
13.
A) imparted
B) immersed
C) injected
D) infected
答案 D
解析宾语是 more than one million people，意为“已感染一百多万人”，与下文 deaths、hospitalizations 构成疫情统计。infect（感染）正合；imparted（传授）、immersed（使沉浸）、injected（注射）均不能以“人”为受感染对象。故选 D infected。
14.
A) released
B) relayed
C) relieved
D) remained
答案 A
解析“联邦卫生官员从国家储备中调拨达菲供儿童使用”，release ... from the stockpile 指从储备中释放/调拨物资。relayed（转达）、relieved（缓解）、remained（保持，不及物）均不能带 Tamiflu 作宾语表“调用”。故选 A released。
15.
A) placing
B) delivering
C) taking
D) giving
答案 C
解析take orders from the states 意为“接受各州的（疫苗）订单”，联邦官员作为受订方接单。placing/giving orders 是下订方的动作，主体颠倒；delivering（交付）逻辑也不符。故选 C taking。
16.
A) feasible
B) available
C) reliable
D) applicable
答案 B
解析形容词作表语，与下句 made available 呼应，意为“疫苗比预期提前供应/到位”。available（可获得的）契合 ahead of expectations；feasible（可行的）、reliable（可靠的）、applicable（适用的）均不能表达“提前可供使用”。故选 B available。
17.
A) prevalent
B) principal
C) innovative
D) initial
答案 D
解析those ___ doses 指 10 月初首批投放的疫苗，意为“最初那批剂量多为鼻喷剂型”。initial（最初的）与时间线 in early October 2009 吻合；prevalent（流行的）、principal（主要的）、innovative（创新的）均不表“首批”之意。故选 D initial。
18.
A) presented
B) restricted
C) recommended
D) introduced
答案 C
解析be recommended for 意为“被推荐用于（某人群）”，此处指鼻喷型疫苗“不推荐用于孕妇、50 岁以上者等”。recommended 与后文 high-risk groups 的接种建议逻辑一致；restricted（限制，多接 to）、presented、introduced 均不合此搭配与句意。故选 C recommended。
19.
A) problems
B) issues
C) agonies
D) sufferings
答案 B
解析several other ___ 与前面具体的 breathing difficulties、heart disease 并列，泛指“其他若干健康问题/状况”。issues 在医学语境中指身体健康方面的问题，搭配中性且地道；problems 语义相近但偏口语、概括过泛；agonies（剧痛）、sufferings（苦难）情感色彩过重，不用于客观列举病症。故选 B issues。
20.
A) involved in
B) caring for
C) concerned with
D) warding off
答案 B
解析people ___ infants 与 health care workers 并列，同属应优先接种的高危/重点群体，意为“照护婴儿的人”。caring for（照料、看护）合乎语境；involved in（涉及）、concerned with（关注于）、warding off（抵御）均不能表达“照顾婴儿”之意。故选 B caring for。