21. The crash of EgyptAir Flight 804 is mentioned to
- A. explain American’s tolerance of current security checks.
- B. stress the urgency to strengthen security worldwide.
- C. highlight the necessity of upgrading major U.S. airports.
- D. emphasize the importance of privacy protection.
答案：A
答案句：Americans are willing to tolerate time-consuming security procedures in return for increased safety. The crash of EgyptAir Flight 804, which terrorists may have downed over the Mediterranean Sea, provides another tragic reminder of why.
参考译文：美国人愿意容忍耗时的安检程序，以换取更高的安全性。埃及航空804航班的坠毁——恐怖分子可能在地中海上空将其击落——再次悲惨地提醒了我们原因。
定位线索：题干“The crash of EgyptAir Flight 804 is mentioned to”→答案句取自第2段“The crash of EgyptAir Flight 804... provides another tragic reminder of why”；文中“tolerate time-consuming security procedures in return for increased safety”对应选项A“explain American's tolerance of current security checks”。
解析：题干问埃及航空804航班坠毁被提及的目的，属于例证题。答案句先提出观点“Americans are willing to tolerate time-consuming security procedures in return for increased safety”，随后用该坠机事件作为例子“provides another tragic reminder of why”，说明例子是为了解释美国人为何容忍安检。正确选项A正是对观点句的同义转述。选项B“stress the urgency to strengthen security worldwide”范围扩大，文中未提及全球范围；选项C“highlight the necessity of upgrading major U.S. airports”偷换概念，例子与机场升级无关；选项D“emphasize the importance of privacy protection”无中生有，文中未涉及隐私。例子本身不是答案依据，例子前面的观点句才是关键。
22. Which of the following contributes to long waits at major airports?
- A. New restrictions on carry-on bags.
- B. The declining efficiency of the TSA.
- C. An increase in the number of travelers.
- D. Frequent unexpected secret checks.
答案：C
答案句：Enhanced security measures since then, combined with a rise in airline travel due to the improving economy and low oil prices, have resulted in long waits at major airports such as Chicago's O'Hare International.
参考译文：自那以后，加强的安保措施，加上由于经济改善和油价低廉导致的航空旅行增加，导致芝加哥奥黑尔国际机场等主要机场出现长时间等待。
定位线索：题干“Which of the following contributes to long waits at major airports”→答案句取自第3段“have resulted in long waits at major airports”；文中“a rise in airline travel”对应选项C“An increase in the number of travelers”。
解析：题干问导致主要机场长时间等待的因素，属于细节题。答案句明确指出“a rise in airline travel”是原因之一，即旅行人数增加，对应选项C“An increase in the number of travelers”。选项A“New restrictions on carry-on bags”无中生有，文中提到的是“overpack their carry-on bags”而非限制；选项B“The declining efficiency of the TSA”偷换概念，文中未说效率下降；选项D“Frequent unexpected secret checks”答非所问，秘密检查是背景而非等待原因。
23. The word “expedited” (Line 4, Para. 5) is closest in meaning to
- A. quieter.
- B. cheaper.
- C. wider.
- D. faster.
答案：D
答案句：PreCheck is supposed to be a win-win for travelers and the TSA. Passengers who pass a background check are eligible to use expedited screening lanes. This allows the TSA to focus on travelers who are higher risk, saving time for everyone involved.
参考译文：PreCheck本应是旅客和TSA的双赢。通过背景调查的乘客有资格使用快速安检通道。这使TSA能够专注于风险较高的旅客，为所有相关人员节省时间。
定位线索：题干“The word 'expedited' (Line 4, Para. 5)”→答案句取自第5段“Passengers who pass a background check are eligible to use expedited screening lanes”；文中“saving time”对应选项D“faster”。
解析：题干问“expedited”的含义，属于词义题。答案句包含该词所在句“Passengers who pass a background check are eligible to use expedited screening lanes”，后文“saving time for everyone involved”提供语境线索，表明该通道能节省时间，因此“expedited”意为“快速的”，对应选项D“faster”。选项A“quieter”、B“cheaper”、C“wider”均无语境支持，无法从上下文推出。
24. One problem with the PreCheck program is
- A. a dramatic reduction of its scale.
- B. its wrongly-directed implementation.
- C. the government’s reluctance to back it.
- D. an unreasonable price for enrollment.
答案：D
答案句：It has not gotten anywhere close to that, and one big reason is sticker shock: Passengers must pay $85 every five years to process their background checks. Since the beginning, this price tag has been PreCheck's fatal flaw.
参考译文：它远未达到那个数字，一个主要原因是标价冲击：乘客每五年必须支付85美元来处理背景调查。从一开始，这个价格标签就是PreCheck的致命缺陷。
定位线索：题干“One problem with the PreCheck program”→答案句取自第6段“one big reason is sticker shock”和“this price tag has been PreCheck's fatal flaw”；文中“pay $85 every five years”对应选项D“an unreasonable price for enrollment”。
解析：题干问PreCheck项目的一个问题，属于细节题。答案句明确指出“sticker shock”和“fatal flaw”，即价格不合理，对应选项D“an unreasonable price for enrollment”。选项A“a dramatic reduction of its scale”偷换概念，文中说“not gotten anywhere close to that”指未达目标而非规模缩减；选项B“its wrongly-directed implementation”无中生有，文中未提实施方向错误；选项C“the government's reluctance to back it”偷换概念，文中建议国会资助，但未说政府不愿支持。
25. Which of the following would be the best title for the text?
- A. Less Screening for More Safety
- B. PreCheck – a Belated Solution
- C. Getting Stuck in Security Lines
- D. Underused PreCheck Lanes
答案：C
答案句：First two hours, now three hours – this is how far in advance authorities are recommending people show up to catch a domestic flight, at least at some major U.S. airports with increasingly massive security lines. … It is long past time to make the program work.
参考译文：先是两小时，现在是三小时——这是当局建议人们提前到达以赶上国内航班的时间，至少在安检队伍日益庞大的美国一些主要机场是这样。……让这个项目发挥作用早已是时候了。
定位线索：题干“Which of the following would be the best title for the text”→答案句取自首段“increasingly massive security lines”和末段“It is long past time to make the program work”；文中“massive security lines”对应选项C“Getting Stuck in Security Lines”。
解析：题干问最佳标题，属于主旨题。首段点明主题“increasingly massive security lines”，全文围绕安检排队问题展开，末段总结“It is long past time to make the program work”，因此选项C“Getting Stuck in Security Lines”最能概括主旨。选项A“Less Screening for More Safety”偷换概念，文中未主张减少安检；选项B“PreCheck – a Belated Solution”范围缩小，PreCheck只是文中一部分；选项D“Underused PreCheck Lanes”范围缩小，同样只涉及部分内容。