补充：
concerned adj(常与with， about连用)挂…念的，担…心的； [常用于名词之后]有关(方面)的
e.g. I am very concerned about her. 我非常挂念她。
e.g. the authorities concerned有关当局
concern oneself with … 关心/关注。。
optimum adj最好的，最佳的；最有利的
A.The same confidence exists between agencies and carriers(运输公司)， including car-rental(汽车租赁) and sightseeing services. (如果有A，前文应该出现描述“。。和。。之间是如何信任”的句子)
B.They offer familiarization (熟悉， 精通)and workshop tours(精通情况和研讨问题的旅游) so that in a short time agents can obtain first-hand knowledge of the tours.
C. Travel operators(经纪人)， specialists in the field of planning， sponsor extensive research programs. (如果有C，后文中可能会接着讨论有关Travel operators的内容)
D.As a result of teamwork， tourism is flouring/ flourishing in all countries.(如果有D， 前文中应该具体谈到“团队合作”)
E. Agencies rely upon the good services of hotels， and， conversely， hotels rely upon agencies， to fulfill their contracts and to send them clients.(A中间已经出现过了agencies)
F. In this way agents learn to explain destinations and to suggest different modes and combinations of travel -- planes， ships， trains， motorcoaches(汽车)， car-rentals(租用)， and even car purchases. (如果有F，则前文中应该出现描述“。。的方式”的句子)
__1__。 They have knowledge of all areas and all carrier services， and they are experts (与C中的specialists呼应)in organizing different types of tours and in preparing effective advertising campaigns.
C.分析：空格后句中的They have knowledge of 和they are experts 暗示“They”在前文中应该指代人，而且是专家，因此确认C为答案(而B中的They在前文中没有明确的指代对象)。
考点：考察代词的指代内容和句子之间语意的平行承接
A.The same confidence exists between agencies and carriers(运输公司)， including car-rental(汽车租赁) and sightseeing services. (如果有A，前文应该出现描述“。。和。。之间是如何信任”的句子)
B.They offer familiarization and workshop tours(精通情况和研讨问题的旅游) so that in a short time agents can obtain first-hand knowledge of the tours.
D.As a result of teamwork， tourism is flouring/ flourishing in all countries.(如果有D， 前文中应该具体谈到“团队合作”)
E. Agencies rely upon the good services of hotels， and， conversely， hotels rely upon agencies， to fulfill their contracts and to send them clients.(A中间已经出现过了agencies)
F. In this way agents learn to explain destinations and to suggest different modes and combinations of travel -- planes， ships， trains， motorcoaches(汽车)， car-rentals(租用)， and even car purchases. (如果有F，则前文中应该出现描述“。。的方式”的句子)
They (仍然指代前文中的Travel operators)distribute materials to agencies， such as journals， brochures(小册子) and advertising projects. __2__。
B.分析：空格前文中在围绕Travel operators这个中心展开叙述，所以到这里(第2段段末句)继续讨论Travel operators的可能性较大(词语提示：代词they的呼应)，这样B(从B中可以看出they应该是“旅游方面的专家”， 这样they指代前文中的核心词Travel operators是合理的)合适。
考点：考察代词的指代内容和句子之间语意的平行承接
A.The same confidence exists between agencies and carriers(运输公司)， including car-rental(汽车租赁) and sightseeing services. (如果有A，前文应该出现描述“。。和。。之间是如何信任”的句子)
D.As a result of teamwork， tourism is flouring/ flourishing in all countries.(如果有D， 前文中应该具体谈到“团队合作”)
E. Agencies rely upon the good services of hotels， and， conversely， hotels rely upon agencies， to fulfill their contracts and to send them clients.(A中间已经出现过了agencies)
F. In this way agents learn to explain destinations and to suggest different modes and combinations of travel -- planes， ships， trains， motorcoaches(汽车)， car-rentals(租用)， and even car purchases. (如果有F，则前文中应该出现描述“。。的方式”的句子)
Tourist counselors(顾问) give valuable seminars(研究会) to acquaint agents with program and techniques in selling. __3__。
F.分析：空格前句中出现核心词Tourist counselors(顾问) 和agents， 而F中的中心词正是agents，而且在句意上F和空格前句承接：F中In this way回应前句中具体行为方式的讲述。
考点：考察this的指代内容。
补充：
Acquaint vt(与with 连用)使熟悉；使相识；(B级词汇)
e，g， be acquainted with知道；相识
invaluable adj其价值无法衡量的
A.The same confidence exists between agencies and carriers(运输公司)， including car-rental(汽车租赁) and sightseeing services. (如果有A，前文应该出现描述“。。和。。之间是如何信任”的句子)
D.As a result of teamwork， tourism is flouring/ flourishing in all countries.(如果有D， 前文中应该具体谈到“团队合作”)
E. Agencies rely upon the good services of hotels， and， conversely， hotels rely upon agencies， to fulfill their contracts and to send them clients.(A中间已经出现过了agencies)
Properties and agencies work closely together to make the most suitable contracts， considering both the comfort of the clients and their own profitable financial arrangement. __4__。
E.分析：对剩下的三个选项进行比较：D(对tourism的总结概括)最可能出现文章最后部分；A的中心词confidence在空格前句中没有词语上的对应，也没有句意上的对应；因此答案只能选择E(E中的“相互依赖”和空格前句中的“紧密合作”在语意上呼应)。
考点：考察句意的平行发展(句子结构的呼应)
A.The same confidence exists between agencies and carriers(运输公司)， including car-rental(汽车租赁) and sightseeing services. (如果有A，前文应该出现描述“。。和。。之间是如何信任”的句子)
D.As a result of teamwork， tourism is flouring/ flourishing in all countries.(如果有D， 前文中应该具体谈到“团队合作”)
__5__。 Carriers are dependent upon agencies to supply passengers， and agencies are dependent upon carriers to present them with marketable tours. All services must work together for greater efficiency， fair pricing and contented customers.
A.分析：从空格在段落中位置的特点和备选项句意的特点，直接判断答案为A.
考点：考察段落之间语意的承接(承上启下句)