Which of the following statements is the most appropriate title for the passage?
单选题
Which of the following statements is the most appropriate title for the passage? A．The Origins of GPS B．The Advantages of GPS C．The Future of GPS D．The Increasing Uses of GPS: Military and Civilian
【正确答案】
D
【答案解析】[解析] 26-30 The Global Positioning System (GPS) has become indispensable for soldiers, pilots, hikers, yachtsmen, even bankers, ever since the U.S. Department of Defense started filling the sky with satellites about 25 years ago, in order to improve navigation for fighters, bombers and warships. More recently, GPS has allowed the development of precision-guided weapons, the smart bombs that home in on targets: between Serbia four years ago and this year's Iraq war, the proportion of such bombs used rose from no more than 3 percent to at least 60 percent. However, the GPS is also an essential prop to countless civil applications; for every military user, there are now 100 civilian users. It provides not only satellite-navigator systems in cars and boats; it is used by Internet service providers, by banks and by surveyors. One day it might be used by air traffic control systems to permit "free flight", in which pilots of commercial aircraft find their own route and stay clear of other aircraft, without the cumbersome business of radio telephone contact with controllers on the ground. [分析] 主旨题。 本题要求把握全文结构脉络。本文主要内容是关于GPS (全球定位系统)的应用。其中，前一部分讨论了GPS在军事方面的应用；中间通过However实现转折，后一部分集中讨论GPS的民用。因此能够反映这种脉络，包含全文主要思想的选项D是正确答案。 [解题关键] 掌握反映全文结构脉络的信号词，有助于判断全文主旨。本文中第二段首however的使用就反映文章的结构走向。
单选题
Why did the United States first launch satellites into space? A．To improve navigation for warplanes and warships. B．To guide smart bombs that home in on moving targets. C．To collect meteorological data. D．To sense remote volcanic eruptions.
【正确答案】
A
【答案解析】[分析] 因果关系的找寻和判断。 原文第一段中说美国发射卫星的目的是“in order to improve navigation for fighters, bombers and warships”即“为战斗机、轰炸机和战舰导航”，由此可见，选项A的说法与原文相符，是正确答案。 [解题关键] 掌握表因果关系的信号词，有助于迅速判断因果关系，从而得到正确答案。如原文中in order to短语的使用，便表明了这种关系。
单选题
How much has the use of precision-guided weapons increased in the past few years? A．Less than 6%. B．More than 6%. C．More than 3%. D．Less than 3%.
【正确答案】
C
【答案解析】[分析] 数字信息的找寻和判断。 根据题干对数字信息的要求找到原文有关部分“…the proportion of such bombs used rose from no more than 3 percent to at least 60 percent"即“这一比例从仅仅 3%上升到至少60%”，由此可见这一上升区间的最低值为大于等于3%，因此选项C的说法符合原文含义，是正确答案。 [解题关键] 关于数值的题目，有时要特别注意文中数字前的修饰成分，如 no more than，not more than，at least，about等，这些成分往往是提问的重点，所以一定要弄清楚它们的确切含义。此处，no more than的意思是“仅仅，只不过”。
单选题
Which of the following is NOT mentioned as civilian users of GPS? A．Hikers, B．Bankers. C．Fishermen. D．Internet service providers.
单选题
Which of the following statements is NOT true of "free flight"? A．Commercial aircraft is guided by GPS. B．Civilian aircraft are free to move over all territories. C．Cargo carders no longer collide with one another. D．Passenger flights are safe to fly with military aircrafts.
【正确答案】
B
【答案解析】[解析] 特定信息的找寻和理解。原文最后部分讲解了什么是“free flight”，其中“pilots of commercial aircraft find their own route”可对应选项A的内容；“stay clear of other aircraft”可与选项C中“no longer collide with one another”对应；并且由上述两点还可推断出选项D的内容是正确的。那么只有选项B的说法与原文不符，因此该选项是正确答案。 [解题关键] 1) 掌握解释某事物的表达法，如本文中解释free flight时，使用了in which定语从句结构；2) 要透过表面解释，根据上下文深入理解某一概念。选项B就是使用了free flight的字面含义来诱导听者。