2021届高考英语二轮复习微专题考点22 完形填空说明文（考点专练）（15页）
2021届高考英语二轮复习微专题
考点22 完形填空说明文
（2011·上海）
Everyone in business has been told that success is all about attracting and retaining (留住) customers. It sounds simple and achievable. But, 1 , words of wisdom are soon forgotten. Once companies have attracted customers they often 2 the second half of the story. In the excitement of beating off the competition, negotiating prices, securing orders, and delivering the product, managers tend to become carried away. They forget what they regard as the boring side of business— 3 that the customer remains a customer. 4 to concentrate on retaining as well as attracting customers costs business huge amounts of money annually. It has been estimated that the average company loses between 10 and 30 per cent of its customers every years. In constantly changing 5 , this is not surprising. What is surprising is the fact that few companies have any idea how many customers they have lost.
Only now are organizations beginning to wake up to those lost opportunities and calculate the 6 implications. Cutting down the number of customers a company loses can make a big 7 in its performance. Research in the US found that a five per cent decrease in the number of defecting (流失的) customers led to 8 increases of between 25 and 85 per cent.
In the US, Domino’s Pizza estimates that a regular customer is worth more than $5,000 over ten years. A customer who receives a poor quality product or service on their first visit and 9 never returns, is losing the company thousands of dollars in 10 profits (more if you consider how many people they are likely to tell about their bad experience).
The logic behind cultivating customer 11 is impossible to deny. “In practice most companies’ marketing effort is focused on getting customers, with little attention paid to 12 them”, says Adrian Payne of Cornfield University’ School of Management. “Research suggests that there is a close relationship between retaining customers and making profits. 13 customers tend to buy more, are predictable and usually cost less to service than new customers. Furthermore, they tend to be less price 14 , and may provide free word-of-mouth advertising. Retaining customers also makes it 15 for competitors to enter a market or increase their share of a market.
1．A．in particular B．in reality C．at least D．first of all
2．A．emphasize B．doubt C．overlook D．believe
3．A．denying B．ensuring C．arguing D．proving
4．A．Moving B．Hoping C．Starting D．Failing
5．A．markets B．tastes C．prices D．expenses
6．A．culture B．social C．financial D．economical
7．A．promise B．plan C．mistake D．difference
8．A．cost B．opportunity C．profit D．budget
9．A．as a result B．on the whole C．in conclusion D．on the contrary
10．A．huge B．potential C．extra D．reasonable
11．A．beliefs B．loyalty C．habits D．interest
12．A．altering B．understanding C．keeping D．attracting
13．A．Assumed B．Respected C．Established D．Unexpected
14．A．agreeable B．flexible C．friendly D．sensitive
15．A．unfair B．difficult C．essential D．convenient
A篇
（2015·重庆高考真题）Imagine the first days in a new time zone. Slow to respond to the 1 , your body clock is confused. You’re sleepy all day, but when it’s time for bed, you can hardly fall asleep. Obviously you are 2 jet lag（时差反应）.
Travelers have traditionally fought this 3 with sleeping pills or alcohol. There are actually healthier ways that can work just as 4 .
For example, the moment you get on the airplane, start 5 your biological block to the destination’s time. If it’s daytime in your destination, try to stay 6 . Walking around the cabin（客舱） can be of help. When it’s nighttime, try to sleep. In that case, eat before the flight, 7 an empty stomach will prevent you from sleeping. These tips will help you start a new 8 of sleep and wakefulness.
1．A．flight B．change C．demand D．climate
2．A．suffering from B．working on C．looking into D．leading to
3．A．danger B．problem C．waste D．fear
4．A．briefly B．slowly C．suddenly D．effectively
5．A．checking B．sending C．adjusting D．stopping
6．A．awake B．alone C．hungry D．calm
7．A．though B．so C．whole D．or
8．A．understanding B．cycle C．research D．trend
B篇
（2012·上海高考真题）People on a college campus were more likely to give money to the March of Dimes if they were asked for a donation by a disabled woman in a wheelchair than if asked by a nondisabled woman. In another 9 , subway riders in New York saw a man carrying a stick stumble（绊脚） and fall to the floor. Sometimes the victim had a large red birthmark on his 10 ; sometimes he did not. In this situation, the victim was more likely to 11 aid if his face was spotless than if he had an unattractive birthmark. In 12 these and other research findings, two themes are 13 : we are more willing to help people we like for some reason and people we think 14 assistance.
In some situations, those who are physically attractive are more likely to receive aid. 15 , in a field study researchers placed a completed application to graduate school in a telephone box at the airport. The application was ready to be 16 , but had apparently been "lost". The photo attached to the application was sometimes that of a very 17 person and sometimes that of a less attractive person. The measure of helping was whether the individual who found the envelope actually mailed it or not. Results showed that people were more likely to 18 the application if the person in the photo was physically attractive.
The degree of 19 between the potential helper and the person in need is also important. For example, people are more likely to help a stranger who is from the same country rather than a foreigner. In one study, shoppers on a busy street in Scotland were more likely to help a person wearing a(n) 20 T-shirt than a person wearing a T-shirt printed with offensive words.
Whether a person receives help depends in part on the "worth" of the case. For example, shoppers in a supermarket were more likely to give someone. 21 to buy milk rather than to buy cookies, probably because milk is thought more essential for 22 than cookies. Passengers on a New York subway were more likely to help a man who fell to the ground if he appeared to be 23 rather than drunk.
9．A．study B．way C．word D．college
10．A．hand B．arm C．face D．back
11．A．refuse B．beg C．lose D．receive
12．A．challenging B．recording C．understanding D．publishing
13．A．important B．possible C．amusing D．missing
14．A．seek B．deserve C．obtain D．accept
15．A．At first B．Above all C．In addition D．For example
16．A．printed B．mailed C．rewritten D．signed
17．A．talented B．good-looking C．helpful D．hard-working
18．A．send in B．throw away C．fill out D．turn down
19．A．similarity B．friendship C．cooperation D．contact
20．A．expensive B．plain C．cheap D．strange
21．A．time B．instructions C．money D．chances
22．A．shoppers B．research C．children D．health
23．A．talkative B．handsome C．calm D．sick
A篇
（2020·黑龙江省哈尔滨三中高三月考）Where are the Bees?
Bees are essential to the production of food we eat. Bees make honey, but they also pollinate (授粉) large areas of 1 such as strawberries, apples and onions. About a third of the food we eat is a(n) 2 of pollination of the bees. 3 , bees have been disappearing at a(n) 4 rate.
In 2006, beekeepers started reporting about something called Colony Collapse Disaster (CCD). The main sign of CCD is the 5 of adult honey bees from a hive. In October of 2006, some beekeepers reported that they had lost between 30 and 90 percent of their hives.
There were many 6 for the disappearance of the bees. But the most convincing one has been 7 to pesticides (杀虫剂) and lifestyles of bees today. Nowadays beekeepers get most of their income not from 8 honey but from renting bees to pollinate plants. This means that the life of the typical bee now 9 travelling all around the country to pollinate crops as the 10 change. That means a lot of traveling on trucks, which is very 11 to bees. It is not 12 for up to 30% of the hive to die during 13 due to stress. In addition, bees that spend most of their time locked up on trucks are not 14 what they usually live on. 15 , they live on a sweet liquid from corn, usually polluted with pesticides.
The 16 reason for the disappearance of bees is not sure, but losing bees is very 17 to the economy. The bee pollination services are 18 over 8 billion a year. With no bees, pollination will have to be done 19 , which would have effects on the quality of food and increase food prices. We hear a lot about big environmental disasters almost every day. 20 one of the biggest may well be the loss of that tiny flying insect.
1．A．flowers B．trees C．crops D．grass
2．A．protection B．result C．power D．impact
3．A．Eventually B．Accidentally C．Interestingly D．Unfortunately
4．A．alarming B．moderate C．amusing D．reasonable
5．A．escape B．loss C．boom D．growth
6．A．chances B．theories C．adjustments D．excuses
7．A．applied B．associated C．related D．involved
8．A．producing B．buying C．keeping D．processing
9．A．includes B．consists C．considers D．stands
10．A．beekeepers B．behaviors C．prices D．seasons
11．A．beneficial B．acceptable C．stressful D．familiar
12．A．likely B．necessary C．unusual D．common
13．A．flight B．circle C．stay D．transport
14．A．interested in B．exposed to C．accustomed to D．hunting for
15．A．Thus B．Otherwise C．Therefore D．Instead
16．A．exact B．extra C．complex D．original
17．A．essential B．dangerous C．insignificant D．costly
18．A．demanding B．remaining C．worth D．valuable
19．A．by chance B．by hand C．in time D．in turn
20．A．But B．For C．Or D．So
B篇
（2020·四川省高三三模）Many of us have characteristics coming from our families. Maybe we have our father's eyes or grandmother's hair color. But there are still other elements of our personalities picked up by 21 our parents, such as our mother's love of cleaning or our dad's 22 of humor.
Researchers learn there are usually three kinds of people from their 23 .
The first kind of people are the job-oriented （以求职为目的的）who 24 to regard a job as simply a way to make money. They 25 to working day after day and don't think it interesting for them to do anything else. If you have a job-oriented father, you may 26 work this way. However, you'll not 27 hold the viewpoint if you grow up close to your job-oriented mother.
The second are the career-oriented who see their jobs as a place to gain 28 . They don't mind working overtime. In fact, some 29 their jobs so much that they are feeling more
comfortable in the 30 than at home. They are always 31 of making progress in their work. Being close to a career-oriented father 32 you'll carry on your father's. 33 enough, having a mother with this viewpoint seems to have little 34 .
The third are the calling-oriented who consider their jobs as a way to have a 35 effect on the world. They are more 36 improving the world around them than 37 a large salary. These people usually come from homes 38 both parents have abilities. This 39 that adolescents need the support of both parents in order to have the confidence.
The good news is --- we still have our 40 to find a career that suits us.
21．A．inviting B．nursing C．protecting D．modeling
22．A．scene B．sense C．right D．gift
23．A．study B．university C．academy D．classroom
24．A．attempt B．manage C．tend D．offer
25．A．are supposed B．are opposed C．look forward D．are linked
26．A．view B．think C．believe D．imagine
27．A．frequently B．constantly C．probably D．potentially
28．A．explanations B．expressions C．directions D．achievements
29．A．addict B．value C．devote D．contribute
30．A．club B．office C．cinema D．pub
31．A．sad B．curious C．proud D．afraid
32．A．equals B．means C．demands D．shows
33．A．Worriedly B．Surely C．Carefully D．Strangely
34．A．influence B．evidence C．justice D．performance
35．A．negative B．side C．bad D．positive
36．A．disappointed at B．concerned about C．puzzled at D．confused at
37．A．paying B．raising C．earning D．making
38．A．where B．whose C．which D．that
39．A．suggests B．insists C．recommends D．convinces
40．A．advice B．difference C．change D．choice
考点练
1．B2．C3．B4．D5．A6．C7．D8．C9．A10．B11．B12．C13．C14．D15．B
【解析】本文是一篇说明文。文章讲述了很多公司把很多精力放在了吸引顾客的方面，而很少去关注如何留住老客户，并说明留住老客户的重要性。
1．考查介词短语辨析。句意：但在现实中，智慧的话语很快就会被遗忘。A. in particular特殊地，特别地；B. in reality事实上；C. at least至少；D. first of all首先。根据空前的but判断应事实并不那么简单。选B。
2．考查动词辨析。句意：公司一旦吸引了顾客，他们常常忽略故事的另一部分。A. emphasize强调；B. doubt怀疑；C. overlook俯瞰，眺望，忽略；D. believe相信。成功吸引顾客之后，常常会忽略故事的另一部分。故选C。
3．考查动词辨析。句意：他们忘记了他们把什么作为生意让人厌烦的那一方面，——确保让顾客成为顾客。A. denying拒绝；B. ensuring确信，确保；C. arguing争吵；D. proving 证明。这里指确保顾客仍然是顾客，而不是流失。故选B。
4．考查动词辨析。句意：未能像吸引顾客那样保持顾客真地让公司损失大量资金。A. Moving移动；B. Hoping希望；C. Starting开始；D. Failing未能。fail to do sth未能做某事。如果不能集中精力留住和吸引客户，每年都会给企业带来巨额损失。故选D。
5．考查名词辨析、句意：在持续变化的市场上，这是不令人吃惊的。A. markets市场；B. tastes味道；C. prices价格；D. expenses花费。此文讲的是公司做生意，故应是市场。选A。
6．考查形容词辨析。句意：直到现在，组织才开始意识到那些失去的机会，并计算其对财务的影响。A. culture文化的；B. social社交的，社会的；C. financial金融的；D. economical经济的。financial implication财务影响。故选C。
7．考查名词辨析。句意：减少一个公司失去的客户数量会对它的业绩产生很大的影响。A. promise承诺；B. plan计划；C. mistake错误；D. difference区别，意义。make a difference有影响，有关系。这里指对业绩有很大的影响。故选D。
8．考查名词辨析。句意：百分之十五的流失的客户导致预算增长在25 - 85%之间。A. cost 费用；B. opportunity机会；C. profit利润；D. budget预算。顾客的流失带来公司预算的增加，故选C。
9．考查介词短语辨析。句意：如果一个顾客第一次拜访就得到了质量差的产品或服务，结果却再也没有回来。A. as a result结果；B. on the whole总体来讲；C. in conclusion总之；D. on the contrary相反。空后是前文的结果，故应选A。
10．考查形容词辨析。句意：那么他就会让公司损失数千美元的潜在利润。A. huge巨大的；B. potential潜在的；C. extra额外的；D. reasonable 合情合理的。没有回头客，损失的潜在的利润。故选B。
11．考查名词辨析。句意：培养客户忠诚度背后的逻辑是不可否认的。A. beliefs相信；B. loyalty忠诚；C. habits习惯；D. interest兴趣。故选B。
12．考查动词辨析。句意：实际上，大多数公司的营销努力都集中在争取客户上，而很少注意到如何留住客户。A. altering改变；B. understanding理解；C. keeping保持；D. attracting吸引。此处应是保持顾客、留住顾客。故选C。
13．考查形容词辨析。句意：与新客户相比，老客户倾向于购买更多、可预测且通常服务成本更低。A. Assumed假定的，假想的；B. Respected受尊重的；C. Established已建立的；D. Unexpected意想不到的。这里指已建立的顾客。故选C。
14．考查形容词辨析。句意：此外，他们往往对价格不太敏感，可能会提供免费的口碑广告。A. agreeable一致的；B. flexible灵活的；C. friendly友好的；D. sensitive敏感的。price sensitive价格敏感性。故选D。
15．考查形容词辨析。句意：留住客户也使得竞争对手很难进入一个市场或增加他们的市场份额。A. unfair不公平的；B. difficult困难的；C. essential重要的；D. convenient方便的。make it difficult for sb to do sth使某人做某事方便。
根据题意选B。
拓展练
A篇1．B2．A3．B4．D5．C6．A7．D8．B
【解析】试题分析：本文讲述在旅行中如何调整你的生物钟。
1．B 考查名词辨析。A flight航班； B change变化； C demand要求； D climate气候；句意：慢慢地对于变化做出反应，你的生物钟就要混淆。根据语境可知本文是关于对于时差的反应，故选B项。
2．A 考查动词短语辨析 suffer from 遭受战争破坏的 work on 从事于；look into调查；lead to 导致；根据时区的变化可知很明显会导致时间反应，故选A项。
3．B 考查名词辨析。Adange 危险性 B problem 问题在于 C waste浪费者 D fear恐惧；句意：游客会用药片和酒精来处理这个问题。根据语境可知对待时差的问题，故选B项。
4．D 考查副词辨析。A briefly 简洁地址 B slowly慢慢地址 C suddenly 突然地址 D effectively有效地；句意：这有几种健康的方法，并且很有效。根据语境可知选D项。
5．C 考查动词辨析。A checking 检查员 B sending送到 C adjusting 调整结构 D stopping停止播送句意：比如，在上飞机前，开始调整你的生物钟到你的目的的的时间。Adjust to 把。。调整到，，故选C项。
6．A 考查形容词辨析。A awake B alone C hungry D calm句意：如果是白天到目的地，试着保持清醒。Stay awake保持清醒，故选A项。
7．D 考查连词辨析。A Though 虽然如此 B so 因此次 C while虽然如此 D or 否则；句意：在这种情况下，提前吃饭，否则，空腹会让阻止你睡。Or表示转折，故选D项。
8．B 考查名词辨析。A Understanding 明白的 B cycle圈； C research 研究；D trend趋势；句意：这些建议能帮你开始新生物钟。根据语境可知选B项。
考点：日常生活类短文
B篇
9．A10．C11．D12．C13．A14．B15．D16．B17．B18．A19．A20．B21．C22．D23．D
【解析】【文章大意】研究表明，出于某种原因，我们更愿意帮助我们喜欢的人和我们认为值得帮助的人。
9．根据下文these and other research findings和in a field study提示，在另一份研究中，所以选A。
【考点定位】考查名词词义及语境理解。
10．根据下文if his face was spotless提示。受害者脸上有一个巨大的红色胎记。
【考点定位】考查名词词义及语境理解。
11．根据下文are more likely to receive aid提示选receive。如果受害者的脸无污点的比有不引人注意的胎记更有可能获得援助。
【考点定位】考查动词词义及语境理解。
12．此处challenge挑战； record记录；understand理解，了解；publish出版。在了解这些和其他研究结果过程中， 发现两个重要的主题。
【考点定位】考查动词词义及语境理解。
13．此处important重要的； possible可能的； amusing 娱乐的； missing失去的。在了解这些和其他研究结果过程中， 发现两个重要的主题。
【考点定位】考查形容词词义及语境理解。
14．deserve意为“值得”。因为某种原因我们更愿意帮助我们喜欢的人和我们认为值得帮助的人。
【考点定位】考查动词词义及语境理解。
15．下文举列说明观点：In some situations, those who are physically attractive are more likely to receive aid，所以选D。
【考点定位】考查介词短语词义及语境理解。
16．根据下文actually mailed it or not提示选mailed。意思是申请被邮寄。
【考点定位】考查动词词义及语境理解。
17．此处talented有才能的； good-looking好看的；helpful 有帮助的；hard-working勤奋的。附在申请上的照片一张是相貌好看的、一张不太有吸引力的人。
【考点定位】考查形容词词义及语境理解。
18．结果表明，如果照片上人外表上有吸引力，人们更可能递送这个申请。send in意为“递送”。
【考点定位】考查动词短语含义及语境理解。
19．在潜在的助手和有需要的人之间的相似程度也很重要。
【考点定位】考查名词词义及语境理解。
20．此处expensive昂贵的； plain 普通的； cheap便宜的； strange奇怪的。穿着T恤上印上挑衅的话和穿着朴素的T恤的人相对比，人们更愿意帮助穿着朴素T恤的人。plain意为“简朴的;朴素的”。
【考点定位】考查形容词词义及语境理解。
21．此处time 时间； instructions 说明；money 钱； chances机会。根据常识应该给钱买牛奶。
【考点定位】考查名词词义及语境理解。
22．对健康来说，牛奶被认为比饼干更不可缺少。
【考点定位】考查名词词义及语境理解。
23．此处talkative 健谈的；handsome英俊的； calm平静的； sick有病的。生病的似乎比喝醉的更容易得到到帮助。
【考点定位】考查形容词词义及语境理解。
模拟练
A篇1．C2．B3．D4．A5．B6．B7．C8．A9．A10．D
11．C12．C13．D14．B15．D16．A17．D18．C19．B20．A
【解析】这是一篇说明文。文章说明了蜜蜂正以惊人的速度消失，这可能和运输、农作物使用杀虫剂以及环境有关，但是没人知道确切原因。文章还说明了这种现象对人类和经济的影响。
1．
考查名词词义辨析。句意：蜜蜂酿蜜，但它们也给大面积的农作物授粉，比如草莓、苹果和洋葱。A. flowers花朵；B. trees数目；C. crops 农作物；D. grass草地。结合后文such as strawberries, apples and onions.可知蜜蜂给大面积的农作物授粉，比如草莓、苹果和洋葱。故选 C 。
2．考查名词词义辨析。句意：我们吃的食物中，大约有三分之一是蜜蜂授粉的结果。A. protection保护；B. result结果；C. power力量；D. impact影响。根据后文to of pollination of the bees.可知此处指人们吃的食物中大约有三分之一是蜜蜂授粉的结果。
a result of “是……的结果”。故选B。
3．考查副词词义辨析。句意：不幸的是，蜜蜂正在以惊人的速度消失。A. Eventually终于；B. Accidentally意外地；C. Interestingly 有趣地；D. Unfortunately不幸地。上文提到蜜蜂对人们的食物有重要作用，但是不幸地是（Unfortunately），蜜蜂正在迅速消失。故选 D 。
4．考查形容词词义辨析。句意：不幸的是，蜜蜂正在以惊人的速度消失。A. alarming使人惊恐的，令人担忧的；B. moderate温和的；C. amusing 有趣的；D. reasonable合理的。根据第二段中In October of 2006, some beekeepers reported that they had lost between 30 and 90 percent of their hives. 可知蜜蜂正在以惊人的速度消失。故选A。
5．考查名词词义辨析。句意：蜂群崩溃失调的主要症状是成年蜜蜂从蜂巢中减少。A. escape逃走；B. loss减少；C. boom 繁荣；D. growth生长。结合后文In October of 2006, some beekeepers reported that they had lost between 30 and 90 percent of their hives. 可知蜂群崩溃失调的主要症状是成年蜜蜂从蜂巢中减少，导致养蜂人报告说他们减少了30%到90%的蜂巢。故选B 。
6．考查名词词义辨析。句意：关于蜜蜂的消失有许多理论。A. chances机会；B. theories理论；C. adjustments 调整；D. excuses借口。根据后文But the most convincing one可知此处指关于蜜蜂的消失有许多理论。其它选项不符合语境。故选 B 。
7．考查动词词义辨析。句意：但最令人信服的是，这与农药和蜜蜂的生活方式有关。A. applied申请；B. associated联系；C. related相关；D. involved涉及。结合后文to pesticides (杀虫剂) and lifestyles of bees today可知最令人信服的是这与农药和蜜蜂的生活方式有关。短语 be related to“与……有关”。故选C。
8．考查动词词义辨析。句意：如今，养蜂人的大部分收入不是来自生产蜂蜜，而是来自租用蜜蜂给植物授粉。A. producing生产；B. buying购买；C. keeping保持；D. processing加工。根据后文honey可知此处指养蜂人的大部分收入不是来自生产蜂蜜。故选A。
9．考查动词词义辨析。句意：这意味着，现在典型的蜜蜂的生活包括随着季节的变化，到全国各地为农作物授粉。A. includes包括；B. consists组成；C. considers考虑；D. stands忍受。结合后文 travelling all around the country to pollinate crops as the 可知蜜蜂的生活如今包括（includes）随着季节的变化，到全国各地为农作物授粉。B选项consist要与介词of搭配，consist of“包括”。故选A。
10．考查名词词义辨析。句意：这意味着，随着季节的变化，典型的蜜蜂现在的生活就是在全国各地为农作物授粉。A. beekeepers养蜂人；B. behaviors行为；C. prices价格；D. seasons季节。蜜蜂给农作物授粉是根据农作物生长季节决定的。其他选项不符合语境。故选D。
11．考查形容词词义辨析。句意：这意味着蜜蜂要经常乘坐卡车，这对蜜蜂来说压力很大。A. beneficial有益的；B. acceptable可接受的；C. stressful 压力大的，紧张的；D. familiar熟悉的。根据后文due to stress可知蜜蜂要经常乘坐卡车，这对蜜蜂来说压力很大。故选C 。
12．
考查形容词词义辨析。句意：在运输过程中，由于压力，高达30%的蜂群死亡并不罕见。A. likely可能的；B. necessary必要的；C. unusual罕见的；D. common普通的。上文提到蜜蜂要经常乘坐卡车，这对蜜蜂来说压力很大，因此在运输过程中由于压力，高达 30% 的蜂群死亡并不罕见。故选C。
13．考查名词词义辨析。句意：在运输过程中，由于压力，高达30%的蜂群死亡并不罕见。A. flight飞行；B. circle 循环；C. stay停留；D. transport运输。结合上文That means a lot of traveling on trucks 可知此处指蜂群在卡车运输过程中因为压力而死亡。故选D。
14．考查短语辨析。句意：此外，大部分时间被锁在卡车上的蜜蜂也没有接触到它们通常赖以生存的环境。A. interested in感兴趣；B. exposed to接触； C. accustomed to习惯于；D. hunting for寻找。根据后文they live on a sweet liquid from corn, usually polluted with pesticides. 可知蜜蜂被关在卡车里，接触不到它们赖以生存的环境，只能吃玉米的甜液为生。短语be exposed to“接触”。故选B。
15．考查副词词义辨析。句意：相反，它们以甜玉米汁为生，这种甜玉米汁通常被农药污染。A. Thus因此；B. Otherwise否则；C. Therefore 因此；D. Instead相反。上文提到蜜蜂被在关在卡车里，接触不到自己赖以生存的环境，相反（Instead），它们只能吃甜玉米汁为生，这种甜玉米汁通常被农药污染。故选 D 。
16．考查形容词词义辨析。句意：蜜蜂消失的确切原因还不清楚，但是失去蜜蜂对经济来说是非常昂贵的。A. exact准确的；B. extra额外的；C. complex 复杂的；D. original原来的。根据后文reason for the disappearance of bees is not sure以及第三段中提到的关于蜜蜂消失有很多理论，那么关于蜜蜂消失的确切原因还不清楚。故选 A。
17．考查形容词词义辨析。句意：蜜蜂消失的确切原因还不清楚，但是失去蜜蜂对经济来说是非常昂贵的。A. essential基本的；B. dangerous危险的；C. insignificant无关紧要的；D. costly昂贵的。根据后文over $ 8 billion a year.可知此处失去蜜蜂对经济来说是非常昂贵的。指故选D 。
18．考查形容词词义辨析。句意：蜜蜂授粉服务每年的价值超过80亿美元。A. demanding要求高的；B. remaining剩下的；C. worth值……的；D. valuable有价值的。结合后文over $ 8 billion a year. 可知蜜蜂授粉服务每年的价值超过80亿美元。
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