海南英语八年级上册期中专练-阅读单选（含解析）
Animals United
Animals United is a 3D German cartoon which is directed by Relmhard Klooss and Holger Tappe. It is a story about animals that get together to find water. Along their journey, lots of funny things happen, and of course, they have a lot of adventures.
The animals in the grasslands in Africa are waiting for the coming flood. However, this year’s flood seems to come later than in other years. The animals become upset and worried. At the same time, some animals from other places come to the grasslands to look for peace. However, the situation seems worse because the water is becoming less and less. So they decide to look for the river.
Finally, they find the reason why they don’t have any water to drink. A dam has been set up so that humans can have a better life. After a long fight with humans, they let the world know that animals are in danger.
This film is about environmental matters. The humans are the bad and the animals are the good. This film is to give humans a warning that they must not destroy the homes of animals or damage nature in order to improve their own life. Humans should know that animals also have their own world.
1．The story of Animals United took place ________.
A．in Germany B．in Africa C．in America D．in Asia
2．The animals become worried, because _________.
A．the year’s flood is coming B．they will have no water to drink
C．there is going to be a fight with humans D．their grasslands were taken up by other animals
3．Along their journey to look for the river, the animals find ________.
A．humans set up a dam B．the river is becoming dry
C．all the animals are in danger D．the world is getting warmer
4．What’s the purpose of the film
A．To ask animals to look for river to drink. B．To stop humans killing animals.
C．To warn people not to destroy nature. D．To prevent humans doing harm to the grasslands.
Now we are in Australia, the sixth largest country in the world. A dream Australian vacation could include surfing(冲浪), adventure activities, and more. However, the following is a list of popular places to visit in Australia.
With the largest group of plants and animals on earth, you’ll see over 430 kinds of birds, hundreds of frogs, bats, and butterflies, and much, much more at the Daintree Rainforest.
The Great Barrier Reef is a group of over 1,000 islands. They are unlike anything else in the world. Scuba diving(潜水), deep sea fishing, boating, and surfing are just a few of the many things to do at the reef.
Whether it’s music, or dance that interests you, the Sydney Opera House is one of Australia’s most important theaters. You can also take a tour of some of the rooms in the Opera House. There are over 1,000.
The wine(酒) tour lasts anywhere from one fun afternoon to three full weeks. Australia is fast making a name for itself in the world of wine. It is a great way to go sightseeing and taste wine.
5．At the Daintree Rainforest, you can ________.
A．see plants and animals B．taste wonderful wine C．do water sports D．enjoy modern plays
6．We can learn a lot about Australia’s ________ in the Opera House.
A．education B．history C．culture D．language
7．The passage may be seen in the ________ part of a newspaper.
A．art B．travel C．technology D．sports
Beijing Opera is one of the traditional Chinese drama art forms and the largest Chinese opera form. Having a history of about 200 years, it is developed from many other drama forms, mostly from the local drama “Huiban”. It was especially popular in south China during the 18th century.
Theatrical (戏剧的) art forms in many other countries do not have singing, dancing and spoken parts together in one single drama. An opera singer, for example, neither dances nor speaks on stage; there are no singing or dancing parts in a modern play; in a dance drama, the dancer doesn’t speak or sing. Traditional Chinese drama, including Beijing Opera, is a kind of entertainment. It includes spoken parts, singing and dancing.
Beijing Opera has spread to many other places. Mei Lanfang, one of the most famous performers of all, was the first to introduce Beijing Opera to foreigners and made highly successful tours to foreign countries.
“You will doubt and sometimes be a little bored, but you will be interested gradually. You will be strongly attracted to Beijing Opera, even if you know nothing about the drama background.” This is how one traveler described his first experience in watching Beijing Opera.
Beijing Opera is China’s national opera and it is full of Chinese cultural traditions. Welcome to China and enjoy Beijing Opera!
8．Beijing Opera is ________.
A．unpopular in north China
B．only developed from the local drama “Huiban”
C．a traditional Chinese drama art form
9．After watching Beijing Opera for the first time, the traveler felt ________.
A．busy B．nervous C．interested
10．The underline word “it” in the last paragraph means _________·
A．Beijing Opera B．local dramas C．a modern play
11．The main purpose of writing the passage is to _________.
A．ask young people to learn Beijing Opera
B．tell us something about Beijing Opera
C．show why Beijing Opera is popular in Europe
How do you go to school every day By bike or on foot Maybe you can try a new way —taking an S’Cool Bus.
The S’Cool Bus is also called the bike herlands is a bike kingdom. Someone invented this kind of bicycle in Netherlands. It’s interesting for kids to ride the bike bus together to go to school.
Also, it is very safe. The bike bus has a driver and eleven seats for kids. Each one has a helmet and safety belt（安全 带）. There is a roof on the bus. It can be used on hot days or rainy days to make kids feel comfortable.
Riding the bike bus is one of the greatest ways for children to get to school. Peter is a 10-year-old boy. He becomes a big fan of the bike bus. “Now the S’Cool Bus is my favorite way of vehicle. I can ride it together with other kids to keep healthy. It’s full of fun.” For most parents, it can help them save a lot of time because they don’t have to pick up their children after school.
The S’Cool Bus is becoming more and more popular in some countries like Germany and France. Its inventor Thomas Tolkamp says, “I hope I can sell the bike bus to more countries in the future. As the green lifestyle（生活方式）becomes popular, ideas like this get popular, too. I think it will work well in other countries.” The use of S’Cool Bus shows us that we can save the Earth in many ways as long as we want to have a try.
12．According to the passage, we can know about that ________.
A．the S’Cool Bus can carry twelve kids B．the S’Cool Bus offers kids helmets and umbrellas
C．the S’Cool Bus has no windows or roof D．the driver and kids drive it together
13．Peter enjoys going to school by ________.
A．riding a horse B．riding his bike C．driving a bus D．riding the S’Cool Bus
14．The underlined phrase “pick up” in the passage means ________.
A．挑选 B．接载 C．辨认 D．检查
15．The S’Cool Bus is becoming more and more popular in ________.
A．Germany and France B．many countries C．some other countries D．England and France
16．Which of the following can be the best title for this passage
A．A Biking Trip to School B．The Best Way to Go Out
C．A Cool Way to School D．The Use of the Bike Bus
Dear Mary,
I am really excited to hear that you will come to Brazil to spend your vacation. Let me tell you about my hometown Rio de Janeiro (里约热内卢) first. It is a big and nice city. If you travel to Rio de Janeiro, you can see the biggest park in Brazil, the biggest library in South America and the biggest football stadium in the world. If you are a football fan, Rio de Janeiro is the best place to travel, because you can see many football stars playing football here.
If you come to Brazil in February, I will take you to go to the carnival. That is really interesting and exciting. It is the biggest carnival in Brazil and it usually lasts three days. During the carnival, you can see a lot of Brazilians in the street, wearing colorful costurnes. You can also join them. It’s great fun. I hope to see you soon!
Lisa
17．The world’s biggest ___________ is in Rio de Janeiro.
A．library B．park C．carnival D．football stadium
18．If you are a football fan, you will be happy to see many football _________ in Rio de Janeiro.
A．stars B．games C．stadiums D．movies
19．When is the biggest carnival in Brazil
A．In February. B．In May. C．In October. D．In December.
20．Which of the following is NOT true
A．Mary will spend her vacation in Brazil.
B．The biggest library of South America is in Rio de Janeiro.
C．The biggest carnival in Brazil lasts for thirty days.
D．The letter is from Lisa to Mary.
The carmaker Volvo announced this week that it would only make electric vehicles（车辆）in 2030. Volvo is the second largest car company to say it will stop making traditional internal combustion engines（传统内燃机）. In January, American carmaker General Motors said it would only make electric vehicles in 2035.
Henrik Green is Volvo’s chief technology officer（首席技术官）. Green says that the first reason for the move to electric vehicle production is to help Volvo meet（满足）the expectations of their customers. Second, there is no long-term future for cars with traditional engines. Third, it will be a helpful way to fight against air pollution. As governments try to reduce pollution, more carmakers like Volvo are increasing production of electric vehicles.
If you want to buy one of these Volvos in about nine years, you will have to make your order online. You will still be able to look at cars at a Volvo store now. The Volvo stores, which are known as dealership（经销商）, will remain in place so that customers can look at cars and have them repaired.
In making the announcement, Volvo says it also plans to show a new eclectic vehicle. The company hopes that in four years, half of its sales around the world will come from electric vehicles. The other half will come from cars known as hybrid cars. Hybrid cars use mixed power of electric and traditional engine to move the vehicles.
Volvo sold about 660, 000 cars worldwide last year. Around the world, about 2-and-a-half million electric vehicles were sold last year and analysts（分析家）expect that to increase by 70% in 2021.
21．By 2030 ________ will have stopped making traditional internal combustion engines.
A．Volvo B．General Motors
C．both Volvo and General Motors D．neither Volvo nor General Motors
22．________ reasons for the Volvo’s move to electric vehicle production are mentioned.
A．Two B．Three C．Four D．Five
23．Who is the chief technology officer of Volvo
A．General Motors. B．Volvo. C．Henry Smith. D．Henrik Green.
24．How many cars did Volvo sell in the year 2020
A．About six hundred and sixty thousand. B．About six million.
C．About 2-and-a-half million. D．About 70% of the year 2021.
25．What does the writer want to tell us
A．Traditional internal combustion will be more popular.
B．The government doesn’t want to fight against air pollution.
C．Volvo will only make electric vehicles in 2030.
D．Volvo is the largest car company in the world.
I have heard men say that seeing is believing. But I would say that feeling is believing, for though I had seen much before, I never knew the very pain of life till now.
My new owner was Nicholas Skinner. He was hard on his drivers, and they were hard on the horses. We worked for long hours and had no Sunday rest. My driver was just as hard as his master, and he had a cruel whip (残忍的鞭子) with something sharp at the end which often cut me and made me bleed. It was a terrible life, and sometimes, I wished I was dead.
One day I nearly got my wish. We were at the railway station when a family of four people hired us. Box after box was put on the top of the cab (马车). Then the driver hit me with his whip and we moved out of the station. I had not eaten or rested since early that morning. I did my best and got along quite well until we came to Ludgate Hill. By then I was exhausted, and the heavy cab was too much for me. My feet went from under me and I fell heavily, knocking all the breath out of me. I lay quite still because I could not move. There were angry voices above me and luggage (行李) was taken off the cab, but it was all like a dream. Cold water was thrown over my head, some medicine was put into my mouth, and I was covered with a cloth.
I don’t know how long I was there until a kind voice asked me to try to get up and I succeeded. Skinner took the doctor’s advice and, after rest and food, I was taken to the horse market ten days later.
26．The second paragraph mainly wants to tell us that ________.
A．Nicholas Skinner was a mean and cruel man
B．the driver made cruel whips to beat the horse
C．the horse lived a hard life with his new owner
27．The underlined word “exhausted” in para. 3 means ________ in the passage.
A．angry B．tired C．worried
28．The right order of what happened to the horse is ________.
①He came to Ludgate Hill.
②A family of four hired the horse.
③The horse fell down and couldn’t move.
④The driver put lots of luggage on the top of the cab.
A．②④①③ B．②①④③ C．②③①④
29．We can infer from the last paragraph that _______.
A．the horse might have a new owner again
B．the doctor saved the horse and took it home
C．the horse got up with the help of Skinner and got better soon
30．What does the writer want people to learn from this passage
A．God help those who help themselves.
B．The rose in her hand, the flavor in mine.
C．Be kind to animals and care much for lives.
There is a big zoo in our city. It’s about five kilometers away from my house. I like all kinds of animals. I often go to the zoo by bus on Sundays. In the zoo, I can see many different kinds of animals, such as monkeys, bears, pandas, tigers, lions, dolphins, and so on. Some animals are friendly, but some are not. Tigers, lions and bears are dangerous. So they have to stay in cages. But I don’t think it’s good for animals to stay in cages (笼子). They are not happy. They should be free. Tigers and lions can run very fast. They catch and eat small animals in the forest. But in the zoo, they stay in small rooms. They walk round and round in the cages, and they want to get out. I feel sorry for them.
Of all the animals, I like dolphins best. The most interesting animals in the zoo are dolphins. I like watching them swim and jump. They swim very fast and jump very high. They are very clever. They can play with balls. They are very friendly to people.
根据短文，从A、B、C、D四个选项中，选出最佳答案。
31．How does the author（作者）usually go to the zoo
A．On foot. B．By train. C．By bus. D．By taxi.
32．What kind of animals are dangerous
A．Rabbits. B．Monkeys. C．Deer. D．Lions.
33．Why do people have to put the tigers in the cages
A．Because they are friendly. B．Because the tigers like to live in cages.
C．Because they can run very fast. D．Because they are dangerous.
34．I like dolphins best because ________.
A．they like water B．they swim fast
C．they are interesting, clever and friendly D．they can jump high
35．Which of the sentences is wrong
A．Some animals are friendly.
B．Dolphins can play with balls.
C．The author(作者) thinks tigers should stay in cages.
D．Tigers usually live in the forest.
New York, London, Paris and other big cities are exciting places to live in. Some people enjoy living in big cities, but some people don’t. In big cities, there are many interesting things to see and do. You can see many kinds of museums, plays and films. You can also buy things from all over the world. But there are many problems in big cities, too. It’s expensive to live there. The population of the big cities is getting larger and larger. Many people study at good schools or universities, but sometimes these people can’t find good jobs or good places to live in. Also, it is hard to keep the cities safe and clean. Those are big problems.
根据材料所提供的信息，判断下列句子正误。
36．All the people like living in big cities.
A．Right. B．Wrong.
37．You can buy things from all over the world in big cities.
A．Right. B．Wrong.
38．There are also lots of problems to live in big cities.
A．Right. B．Wrong.
39．People in big cities can study at good universities and it’s easy for them to get good jobs.
A．Right. B．Wrong.
40．All the big cities are safe and clean.
A．Right. B．Wrong.
Dogs might be able to help fight against cancer (癌症)! Researchers at California’s Pine Street Foundation (PSF) say they have trained five dogs to smell cancer on a person’s breath. This could be exciting news. If the cancer is found early enough, there is still time to stop it from getting worse.
Dogs have 20 to 40 times as many smell receptors (嗅觉接收器) as humans do. There are special cells (细胞) in the nose. Also, a dog’s sense of smell may be 10,000 to 100,000 times stronger than ours. But can dogs really smell illnesses
PSF researcher McCulloch and his team asked four healthy people and one with cancer to blow into bottles. The bottles were then placed in different rooms. Finally, the dogs were asked to smell the bottles.
McCulloch says that dogs really can smell illnesses. “We were very surprised by how good they were,” he told CNN. “They were recognising who had cancer, and they were also saying who didn’t.” Each dog had been trained for three weeks to sit when it smelled cancer. 99% of the time, the dogs sat next to the bottles with cancer.
No lab test for cancer has given more correct results than this experiment. The results are so amazing that many experts (专家) question the dogs’ smelling power. They want to know if there were other reasons why the dogs did so well. For example, how the dogs acted could have depended on the way of training.
However, most experts agree that this study is important. The information could help scientists develop a new and simple way to deal with cancer in the future. Once again, humans may be getting a helping foot—or nose—from their best animal friends.
41．Researchers at PSF trained dogs to ________.
A．smell cancer B．check the lab test
C．work out the treatment D．develop their sense of smell
42．The underlined word “They” in the fourth paragraph refers to (指代) ________.
A．researchers B．patients C．experts D．dogs
43．What do we know from the passage
A．Experiment results depend on the number of dogs.
B．Dogs might be able to help with medical problems.
C．Dogs were allowed to smell the bottles in the same room.
D．Researchers have found other reasons why the dogs did so well.
参考答案：
1．B 2．B 3．A 4．C
【导语】本文是一篇记叙文。文章主要讲了《动物总动员》是一部3D动画片，动画片介绍了小动物们为了保护它们的家园而与人类作斗争的故事。
1．细节理解题。根据“The animals in the grasslands in Africa are waiting for the coming flood.”可知这个故事发生在非洲，故选B。
2．推理判断题。根据“The animals in the grasslands in Africa are waiting for the coming flood. However, this year’s flood seems to come later than in other years. The animals become upset and worried.”和“However, the situation seems worse because the water is becoming less and less. So they decide to look for the river.”可知，动物们感到不安和着急的原因是水越来越少，它们会没有水喝，故选B。
3．细节理解题。根据“Finally, they find the reason why they don’t have any water to drink. A dam has been set up so that humans can have a better life. ”可知，在寻找河流的途中，动物们发现它们没有水喝是因为人类筑起了水坝。故选A。
4．推理判断题。通读全文以及“This film is to give humans a warning that they must not destroy the homes of animals or damage nature in order to improve their own life.”可知，这部电影主要是告诉人们不要破坏自然，故选C。
5．A 6．C 7．B
【分析】文章讲述了世界第六大国澳大利亚，详细介绍了澳大利亚最受欢迎的活动以及旅游景点。
5．细节理解题。根据“With the largest group of plants and animals on earth...much more at the Daintree Rainforest.”可知，在Daintree Rainforest可以看到植物和动物；故选A。
6．细节理解题。根据“Whether it’s music, or dance that interests you, the Sydney Opera House is one of Australia’s most important theaters.”可知，我们可以在歌剧院学到很多关于澳大利亚文化的知识，故选C。
7．推理判断题。根据“Now we are in Australia, the sixth largest country in the world...However, the following is a list of popular places to visit in Australia.”以及后文的介绍可知，文章主要介绍了澳大利亚最受欢迎的活动以及旅游景点，应该是在报纸的旅游版块，故选B。
8．C 9．C 10．A 11．B
【分析】本文是一篇说明文。主要向我们介绍了中国传统戏剧艺术形式之一——京剧。
8．细节理解题。根据“Beijing Opera is one of the traditional Chinese drama art forms and the largest Chinese opera form.”可知，京剧是中国传统戏剧艺术形式之一。故选C。
9．细节理解题。根据“You will doubt and sometimes be a little bored, but you will be interested gradually. You will be strongly attracted to Beijing Opera, even if you know nothing about the drama background.”可知，刚开始会觉得京剧很无聊，但是你会逐渐感兴趣。故选C。
10．词义猜测题。根据“Beijing Opera is China’s national opera and it is full of Chinese cultural traditions.”可知，京剧充满了中国的文化传统，因此“it”代指“Beijing Opera”。故选A。
11．推理判断题。通读全文可知，主要向我们介绍了中国传统戏剧艺术形式之一——京剧，由此可见，这篇文章的主要目的是告诉我们一些京剧的事情。故选B。
12．D 13．D 14．B 15．A 16．C
【导语】本文主要介绍了一种名为S’Cool的新型公交车。
12．推理判断题。根据“It’s interesting for kids to ride the bike bus together to go to school.”可知司机和孩子们一起驾驶S’Cool公交车。故选D。
13．细节理解题。根据“Now the S’Cool Bus is my favorite way of vehicle. I can ride it together with other kids to keep healthy. ”可知Peter乘坐S’Cool公交车去学校。故选D。
14．词义猜测题。根据“For most parents, it can help them save a lot of time because they don’t have to pick up their children after school.”可知这种公交车帮助家长节省了时间，所以他们不用在放学后去接孩子，故推测划线词意为”接载”。故选B。
15．细节理解题。根据“The S’Cool Bus is becoming more and more popular in some countries like Germany and France.”可知S’Cool公交车在德国和法国等一些国家越来越受欢迎。故选A。
16．最佳标题题。根据“How do you go to school every day By bike or on foot Maybe you can try a new way —taking an S’Cool Bus.”可知本文主要介绍了一种新型的公交车，因此判断本文最好的标题为“一种很酷的上学方式”，故选C。
17．D 18．A 19．A 20．C
【分析】本文是丽萨写给玛丽的一封信，信中介绍了里约热内卢的建筑和巴西举行的狂欢节。
17．细节理解题。根据第一段“If you travel to Rio de Janeiro…the biggest football stadium in the world.”可知，世界上最大的足球场在里约热内卢。故选D。
18．细节理解题。根据第一段“If you are a football fan, Rio de Janeiro is the best place to travel, because you can see many football stars playing football here.”可知，如果你是足球迷，你在里约热内卢将看到许多足球明星。故选A。
19．细节理解题。根据第二段“If you come to Brazil in February, I will take you to go to the carnival.”可知，巴西最大的狂欢节于2月举行。故选A。
20．细节理解题。根据第二段“It is the biggest carnival in Brazil and it usually lasts three days.”可知，巴西最大的狂欢节持续三天，不是三十天。故选C。
21．A 22．B 23．D 24．A 25．C
【导语】本文主要介绍了以沃尔沃为代表的汽车制造商将向电动汽车生产转型。这不仅仅是为了满足客户的需求也是为了对抗空气污染。
21．细节理解题。根据“The carmaker Volvo announced this week that it would only make electric vehicles（车辆）in 2030. Volvo is the second largest car company to say it will stop making traditional internal combustion engines”可知，到2030年停止生产传统内燃机的汽车制造商是沃尔沃。故选A。
22．细节理解题。根据“Green says that the first reason for the move to electric vehicle production is to help Volvo meet（满足）the expectations of their customers. Second, there is no long-term future for cars with traditional engines. Third, it will be a helpful way to fight against air pollution.”可知，沃尔沃转向电动汽车生产的原因一共有三个。故选B。
23．细节理解题。根据“Henrik Green is Volvo’s chief technology officer”可知，Henrik Green是沃尔沃的首席技术官。故选D。
24．细节理解题。根据“Volvo sold about 660, 000 cars worldwide last year. Around the world, about 2-and-a-half million electric vehicles were sold last year and analysts（分析家）expect that to increase by 70% in 2021.”可知，分析家预计2021年的数据会增加70%，因此上文的last year指的是2020年，沃尔沃2020年在全球销售了约66万辆汽车。故选A。
25．细节理解题。根据“The carmaker Volvo announced this week that it would only make electric vehicles（车辆）in 2030.”可知，作者想告诉我们沃尔沃将在2030年只生产电动汽车。故选C。
26．C 27．B 28．A 29．A 30．C
【导语】本文主要讲述了一匹拉车的马被虐待最终支不住的故事。
26．主旨大意题。根据“It was a terrible life, and sometimes, I wished I was dead”以及第二段的内容可知，马的新主人对马夫和马都十分严厉，此段想表达的是马跟新主人一起生存在恶劣的环境里，故选C。
27．词义猜测题。根据“By then I was exhausted, and the heavy cab was too much for me. My feet went from under me and I fell heavily, knocking all the breath out of me”可知，马那时候已经精疲力尽，重重地摔了一跤，所以exhausted与tired同义，故选B。
28．细节理解题。根据“We were at the railway station when a family of four people hired us. Box after box was put on the top of the cab”以及“I did my best and got along quite well until we came to Ludgate Hill...I lay quite still because I could not move.”可知，一家四口雇了这辆马车，然后在马车上放了许多行李，然后来到了Ludgate Hill，最后重重地摔了一跤，不能动弹，所以先是②再是④然后是①，最后是③，故选A。
29．推理判断题。根据“I was taken to the horse market ten days later”可知，这匹马又被带到马市寻找新的主人，故选A。
30．主旨大意题。本文主要讲述了一匹拉车的马被虐待最终支不住的故事来告诉我们：善待动物，关爱生命，故选C。
31．C 32．D 33．D 34．C 35．C
【分析】本文是一篇记叙文，介绍了作者家附近有一个动物园，作者详细介绍了动物园的各种动物。
31．细节理解题。根据“I often go to the zoo by bus on Sundays”，可知作者经常乘公交车去动物园，故选C。
32．细节理解题。根据“Tigers, lions and bears are dangerous”，可知老虎、狮子和熊很危险，故选D。
33．细节理解题。根据“Tigers, lions and bears are dangerous. So they have to stay in cages”，可知把它们关在笼子里是因为它们很危险，故选D。
34．细节理解题。根据“The most interesting animals in the zoo are dolphins...They are very clever. They can play with balls. They are very friendly to people”，可知作者喜欢海豚是因为它们有趣、聪明、友善，故选C。
35．细节理解题。根据“But I don’t think it’s good for animals to stay in cages (笼子). They are not happy. They should be free”，可知作者认为动物不应该被关在笼子里，故选C。
36．B 37．A 38．A 39．B 40．B
【分析】本文主要介绍了在大城市居住的优缺点。
36．细节理解题。根据“Some people enjoy living in big cities, but some people don’t”可知，一些人们喜欢住在大城市，而不是全部的，故选B。
37．细节理解题。根据“You can also buy things from all over the world”可知，在大城市你可以买到世界各地的东西，故选A。
38．细节理解题。根据“But there are many problems in big cities, too”可知，在大城市居住也有许多问题，故选A。
39．细节理解题。根据“Many people study at good schools or universities, but sometimes these people can’t find good jobs or good places to live in”可知，许多人在好的学校或大学学习，但有时这些人找不到好工作，故选B。
40．细节理解题。根据“Also, it is hard to keep the cities safe and clean”可知，很难保持城市的安全和清洁，故选B。
41．A 42．D 43．B
【导语】本文是一篇记叙文。文章讲述了研究者认为在未来狗可能能帮助人们嗅出癌症，从而为这个医学问题开启一条简捷的方式。
41．细节理解题。根据“Researchers at California’s Pine Street Foundation (PSF) say they have trained five dogs to smell cancer on a person’s breath.”可知PSF的研究者训练了五只狗通过嗅人的呼吸来嗅癌症，故选A。
42．词义猜测题。根据“McCulloch says that dogs really can smell illnesses. ‘We were very surprised by how good they were,’” 可知此处是说狗真的能嗅出疾病，所以此处应是说狗可以辨认出谁有癌症和谁没有，故选D。
43．细节理解题。根据“Dogs might be able to help fight against cancer”和全文可知研究者认为狗可能帮助人们对抗癌症，在这一医学问题上提供帮助，故选B。
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