04：【好题精选】阅读还原（六选五）-2023年九年级下学期英语专题周周练（第一期）（山东省青岛市）（含答案）

04：【好题精选】阅读还原（六选五）-2023年九年级下学期
英语专题周周练（第一期）（青岛市）
学校:___________姓名：___________班级：___________考号：___________
一、阅读还原6选5
If you want to tell a story, or tell people about your ideas, a picture can often be better than words. ____1____. Everyone knows the most famous example of moving pictures—the cinema.
The invention of cinema
The cinema was invented at the end of the 19th century. In 1892, with his assistant, Edison invented the kinetoscope (活动电影机), a machine for looking at moving pictures. To see the pictures, you had to look through a small hole at the top of the machine. ____2____.
The development of cinema
Films developed quickly and became more popular. ____3____. The places to see films became bigger and more comfortable. At first, people could watch films only in cinemas. With the invention of television, people began to watch films in their own homes. Living rooms with large-screen TV sets were like small cinemas at home.
During recent years, companies began to develop new ways to record television programs with machines that had memory. ____4____. You can pay to download films and TV programs on the internet and watch them at any time.
The cinema has changed a lot. Will cinemas become a thing of the past We can’t be sure. ____5____, but some people think that cinemas are still the best places to watch movies.
根据短文内容，从选项中选出能填入文中空白处的最佳选项，选项中有一项为多余选项。
A．And moving pictures can be much better
B．Only one person could look in each machine
C．Watching movies at home or in a cinema are both great fun
D．This way your television set can save films, almost like a computer
E．People soon began to open places to show these new films to the public
F．Most people preferred traditional cinemas because the sound was clearer
As we know, there are differences between Western culture and Chinese culture. The words about plants and animals ore used in good or bad ways in different cultures. ____6____ Most expressions in Chinese about the dog, for example, “a homeless dog”, “a mad dog”, “a running dog” and “a dog catching a mouse”, have bad meanings. ____7____
In English, people use the dog to describe good actions. For example, “You are a lucky dog” means you are a lucky person. And “Every dog hos its day” means each person has good luck sometimes. To describe a person’s serious illness, they say “sick as a dog”. The word “dog tired” means very tired. ____8____ But an Western culture, “cat” is often used to describe a woman who is unkind. There ore many other examples of how “cat” is used differently as well.
____9____ People think the rose stands for love, peace, courage and friendship. And the rose is the national flower of Britain, America and many other countries.
____10____ We can learn about many differences in cultures by comparing how some words are used.
根据短文内容，从下列选项中选出能填入空白处的最佳选项。选项中有一项为多余选项。
A．Chinese love cats very much.
B．Let’s look at some words about animals and plants.
C．We can see differences when we pay attention to the way
D．However, westerners love cols very much.
E．But in Western countries, dogs are considered to the honest and good friends of humans.
F．The rose is regarded as a symbol of love in both China and some Western countries.
阅读下面短文，从短文后的选项中，选出可以填入空白处的最佳选项。选项中有一项为多余选项。
There are some skills for students to listen to teacher in class, which means you’re going to have to practice it. Just as you would have to practice basketball to be a better player, you also have to practice listening. How to listen in school ____11____
One of the things you need to do is to make sure that your mind doesn’t wander (漫游). It’s easy to start thinking about other things, especially when you’re not interested in the subject. ____12____
Next, listen for the main ideas. If you want to catch every little piece of information, you’ll feel tired and bored: ____13____ Not only does this show respect (尊重) to the teacher, it also helps prevent your mind from wandering. ____14____ Or it could just be someone talking to their neighbors who shouldn’t be. It can even be some birds outside the classroom window, or a group of kids who are talking loudly as they pass the door to your room.
Finally, you need to take notes because you can not remember everything the teacher says. You’ll have to take down the notes so that you can study it after class. ____15____ Listening isn’t always easy, but if you follow these simple steps, you’ll be much more successful in your classes.
A．Here are some suggestions.
B．You’ll also need to look at the teacher.
C．It might be a friend who is trying to pass you a note.
D．Taking notes also makes you pay attention to the class.
E．So make yourself pay attention to what the teacher is saying.
F．It’s not necessary for you to make notes.
阅读短文，从六个句子中选择五个还原到短文中，使短文通顺完整、衔接自然。
Health is far more important than wealth and wisdom. Good health makes us enjoy our life and achieve what we hope for in our future life. ____16____ Although we have lots of good medical treatment nowadays, it is still necessary for us to learn how to stay healthy. If you want to become as fit as you wish, you must keep some rules in mind.
Firstly, it is very important for us to eat more fruit and vegetables because vitamins (维他命) are provided by them. ____17____
Secondly, we have to keep a healthy diet and regular eating habits. Proper nutrition (营养) is important for good health. ____18____ Eat plenty of food high in protein (蛋白质).
Thirdly, we’d better take exercise every day. ____19____ We have too much pressure (压力) from work or study today. Getting too tired all the time may make us become weak when we meet some sudden accidents. It can also make us easily get sick.
Finally, we have to give up those habits that are bad for us, ____20____
In a word, if we pay attention to the things mentioned above, we will lead a healthy life.
A．such as drinking and smoking.
B．They can keep us in good health.
C．Don’t eat food with lots of sugar and fat.
D．We all know food is very important for all of us.
E．Enough sports can make our bodies strong and relax ourselves.
F．But poor health makes us become less interested in everything around us.
When we think of famous inventors, we usually think of men like Alexander Graham Bell and Thomas Edison. ___21___
Let’s take the dishwasher(洗碗机) as an example. ___22___ She was a rich American who gave a lot of dinner parties. But she was mad that her servants used to break plates and glasses when they were washing the dishes after a party. So, Josephine decided to try and invent a machine which could wash a lot of plates and glasses safely. She said, “___23___” She designed the machine, and then she found a company to make it. At first only hotels and restaurants bought Josephine’s new machine, but today the dishwasher is used by millions of people all over the world.
The car was invented by a man. ___24___ Her name was Mary Anderson. Before her invention appeared, it was impossible for drivers to see where they were going when it was raining or snowing. ___25___ So what’s the name of Mary’s invention Windshield wipers(雨刷).
根据短文内容，从选项中选出能填入文中空白处的最佳选项，选项中有一项为多余选项。
A．If nobody else is going to invent a dishwasher, then I will!
B．But they didn’t solve all the problems.
C．However, it was a woman who solved one of the biggest problems of driving.
D．But many of the things that make our lives easier today were invented by women.
E．They had to open the window.
F．It was invented by a woman named Josephine Cochran in 1886.
阅读下文，从短文后的六个选项中选出能填入空白处的最佳选项。
Playing sports has a lot of fun. But getting hurt is unavoidable. ____26____
Wear protective equipment.
The equipment you wear depends on the sport you play. Helmets (头盔) are the most common protective equipment. They protect your head while you’re playing football, baseball and softball, biking and so on.
Warm up.
____27____ Doing some stretching exercises can get you prepared to play sports. By warming up, you get yourself ready to play. Warming up your muscles and practising a sport help keep you safe, too.
Know the rules of the games.
Traffic lights help prevent crashes between the cars that drive on the roads together. This works because drivers know the rules and follow them—at least most of the time. ____28____ When players know the rules of the games, fewer injuries will happen. For example, you know that in football you can’t come from behind, crash into a player’s legs and steal the ball. It’s more safer to go after the ball rather than the player.
____29____
Some rules have nothing to do with scoring points. They are just about protecting other people. For example, a diver would make sure that the pool is clear before diving in. Otherwise, he or she might land on someone else.
____30____
This is a really important one. If you love sports, you may get right back to the game even you’re injured. But playing when you’re hurt is a bad idea. It can lead to an even worse injury.
A．Watch out for others.
B．Don’t do too much exercise.
C．It’s the same way with sports.
D．Don’t play when you’re injured.
E．It’s not a good idea to just go to the field and start playing.
F．Take these steps to prevent injuries so that you can stay in the game.
根据材料内容，根据短文内容从下面六个选项中，选择五个还原到文中，使短文意思通顺、结构完整。
I couldn’t believe what I’d done. I’d run away﹣me!
I’m not very brave and I love my parents very much. ___31___ I felt sad for my parents. Poor mother and father! ___32___ I couldn’t get married to a terrible old man like Buffalo.
I knew they would follow me quickly, so I told the spaceship to take me to a very quiet part of the Galaxy, a long way from any planets with people on. ___33___ How can a spaceship travel across the Galaxy in no time at all
Well, I learned the answer to that in school. There are a lot of little black holes in space. ___34___ A spaceship goes into one black hole and comes out of another black hole on the other side of the Galaxy.
Don’t ask me how a big thing like a spaceship can go into a thing as small as a potato. I was probably asleep when the robot teacher told me the answer to that. ___35___ I was in the middle of the Galaxy in empty space.
A．Nobody could find me now.
B．The spaceship went.
C．I never thought I could ever not listen to them.
D．The spaceship remained in the same place.
E．But I had to live my own life.
F．They are about as big as a potato.
Huang Yu’s beloved cat Dasuan died. Huang was quite sad. ____36____ Huang got a new cat that looks almost the same as Dasuan, thanks to cloning (克隆) technology.
____37____ The cat was born inside a lab owned by company in Beijing. To clone the cat, the company’s experts took cells (细胞) from Dasuan and created an embryo(胚胎). Then they put it into a cat mother.
____38____ In 2001, the world’s first cloned cat was born in the US. In 2005, the world’s first cloned dog was born in South Korea. Since cats have unique reproductive features(繁殖特征), they are more difficult to clone.
____39____ Though the cloned pets copy the dead pet’s appearance, they have different characters. That’s why pet owners have different opinions about this. Some pet lovers like Huang think a cloned pet is a good replacement (替代品) for their dead pets. But others worry that having the same appearance but a different personality will lead to more pain in the long run. Knowing this, the company says it hopes to use AI and other technologies to move their memories to cloned pets in the future.
Moreover, scientists think cloned pets aren’t as healthy as naturally born pets. ____40____
Some animal lovers think cloning pets is unacceptable because a large number of stray animals (流浪动物) still need homes. They say there is no need to clone.
A．In fact, cloning pets is not a new thing.
B．Most people are interested in cloned pets.
C．But 66 days later, Dasuan “came back”.
D．They may live shorter lives.
E．However, there are arguments against pet cloning.
F．Dasuan is China’s first cloned cat.
Rice, chicken, tomatoes … These foods are so common in our lives today. ____41____ By the year 2050, the world’s population will reach 9.1 billion. To feed everyone, we may need to change our food in some ways.
Meat made in lab
Making meat in lab will reduce greenhouse gases. ____42____ A company in Australia makes meat with cells from animals. It makes both traditional meat like pork and chicken.
Insects become tasty
Insects have as much protein (蛋白质) as fish and meat. ____43____ They don’t need a lot of food and water. They don’t need a big place to live. Many of them are also tasty. Insects like grasshoppers (蝗虫) and ants are on dining tables in many Asian and African countries.
____44____
Scientists are thinking to add natural “seasonings” (调料品) in vegetables. The “seasonings” come from some animals. ____45____ This encourages people to eat more vegetables.
A．Smart way to eat vegetables.
B．Also, people can make it healthier by cutting out fat.
C．They make the vegetables taste better.
D．What about food in the future
E．But raising insects is much easier.
F．What kind of food would you like to eat
With the rapid development of science and technology, our daily life has changed a lot. A young Toronto inventor named Adrien Beyk has made a great contribution (贡献) to this. He created Quanta Vici, a line of gloves and socks. ____46____ They are connected to the user’s smart phone and can be electronically heated at the touch of a button.
Beyk came up with the idea while studying engineering at Ryerson University in Toronto and dealing with Canadian winters. He said, “It’s like a three-minute walk, but my hands and feet would freeze. I want to put what I’ve learned into practice and invent something to help with this. ____47____ It took him three years to work on this.
Using what the company calls “smart sense control”, the inventor has made great progress in warmth lasting time of the gloves. ____48____ Some users say it is significantly (显著的) longer than other heated gloves on the market. ____49____ Accordingly, this advantage has attracted many music lovers.
Beyk said it was his love for computer engineering and fashion that made him interested in starting Quanta Vici. “____50____ The great imagination has been leading me to better the gloves all the time,” he said.
根据短文内容，从选项中选出能填入文中空白处的最佳选项，选项中有一项为多余选项。
A．The biggest thing about this is that they’re smart.
B．They can keep the user’s preferred temperature for up to 6.5 hours.
C．Besides, they are thin enough to be used to play musical instruments.
D．They can keep us warm in the coldest Canadian winters.
E．The gloves are planned to be available in the New Year.
F．This seemed like a great chance to mix fashion and technology.
参考答案：
1．A 2．B 3．E 4．D 5．C
【导语】本文主要介绍了电影制片业的历史，包括发明和发展变化。
1．根据后句“Everyone knows the most famous example of moving pictures—the cinema.”可知此处内容应和“moving pictures”有关，因此选项A“而且移动的图片会更好。”符合语境。故选A。
2．根据前句“To see the pictures, you had to look through a small hole at the top of the machine.”可知此处也应介绍活动电影机的局限性，因此选项B“每台机器只有一个人可以看。”符合语境。故选B。
3．根据前句“Films developed quickly and became more popular.”及后句“The places to see films became bigger and more comfortable. ”可知此处应介绍和播放电影的场所有关的内容，因此选项E“人们很快就开始开设给公众播放这些新电影的场所。”符合语境。故选E。
4．根据前句“During recent years, companies began to develop new ways to record television programs with machines that had memory.”可知此处应和用机器储存电视节目的新方法有关，因此选项D“这样你的电视就可以储存电影，就像电脑一样。”符合语境。故选D。
5．根据后句“but some people think that cinemas are still the best places to watch movies”可知此处应和后句表示转折关系，因此选项C“在家里或者在电影院看电影都是有趣的事。”符合语境。故选C。
6．B 7．E 8．A 9．F 10．C
【导语】本文主要介绍了中西方文化差异。
6．根据前文“The words about plants and animals ore used in good or bad ways in different cultures.”可知，接下来要列举关于动物和植物的单词，选项B“让我们来看一些关于动物和植物的单词。”符合情景，故选B。
7． 根据前文“Most expressions in Chinese about the dog, for example, ‘a homeless dog’, ‘a mad dog’, ‘a running dog’ and ‘a dog catching a mouse’, have bad meanings.”可知，后文要介绍西方文化中关于“狗”一些内容，选项E“但在西方国家，狗被认为是人类诚实的好朋友。”符合情景，故选E。
8．根据后文“But an Western culture, “cat” is often used to describe a woman who is unkind.”可知，此处应该是中国文化中关于猫的内容。选项A“中国人非常喜欢猫。”符合情景，故选A。
9．根据后文“People think the rose stands for love, peace, courage and friendship.”可知，此处应该是关于玫瑰的信息。选项F“在中国和一些西方国家，玫瑰都被视为爱情的象征。”符合情景，故选F。
10．根据后文“We can learn about many differences in cultures by comparing how some words are used.”可推知，此句应为关于植物和动物的词汇在不同的文化中有好有坏的用法，是对前文的总结。选项C“当我们注意方式时，我们可以看到差异”符合情景，故选C。
11．A 12．E 13．B 14．C 15．D
【导语】本文针对如何高效听课给出了几条建议。
11．根据前文“How to listen in school ”以及下面给出具体建议可知，此处总述下文将提到的几点建议，选项A“这里有一些建议。”符合语境，故选A。
12．根据“One of the things you need to do is to make sure that your mind doesn’t wander (漫游).”可知，本段主要介绍应该集中注意力，选项E“所以你要注意听老师讲课。”符合语境，故选E。
13．根据“Not only does this show respect (尊重) to the teacher, it also helps prevent your mind from wandering.”可知，此处主要讲述上课时应该注视老师，不仅是对老师的尊重，还可以防思维散漫，选项B“你还需要看老师。”符合语境，故选B。
14．根据“it also helps prevent your mind from wandering”及“Or it could just be someone talking to their neighbors who shouldn’t be.”可知，此处介绍了上课走神的情况，选项C“可能是你的朋友想要给你传个纸条。”符合语境，故选C。
15．根据“Finally, you need to take notes because you can not remember everything the teacher says.”可知，本段讲的是记笔记的好处，选项D“记笔记也能让你集中注意力上课。”符合语境，故选D。
16．F 17．B 18．C 19．E 20．A
【导语】本文是一篇说明文，介绍健康的重要性并给出一些建议。
16．根据“Good health makes us enjoy our life and achieve what we hope for in our future life.”可知，选项F“但糟糕的健康状况会让我们对周围的一切不那么感兴趣。”符合语境，故选F。
17．根据“Firstly, it is very important for us to eat more fruit and vegetables because vitamins (维他命) are provided by them.”可知，对我们来说多吃水果和蔬菜是非常重要的，因为维生素是由它们提供的。选项B“它们可以让我们保持健康。”符合语境，故选B。
18．根据“Secondly, we have to keep a healthy diet and regular eating habits. Proper nutrition (营养) is important for good health...Eat plenty of food high in protein (蛋白质).”可知，此处介绍健康饮食，选项C“不要吃高糖高脂肪的食物。”符合语境，故选C。
19．根据“Thirdly, we’d better take exercise every day.”可知，此处提到运动，选项E“足够的运动可以使我们的身体强壮，放松自己。”符合语境，故选E。
20．根据“Finally, we have to give up those habits that are bad for us, ”可知，我们必须放弃那些对我们有害的习惯，选项A“比如喝酒和抽烟。”符合语境，故选A。
21．D 22．F 23．A 24．C 25．E
【导语】本文主要介绍了一些女发明家以及她们的发明。
21．根据“When we think of famous inventors, we usually think of men like Alexander Graham Bell and Thomas Edison.”可知，是在说男性发明家，结合下文介绍女发明家及她们的发明可知，此处是在说女性发明家，选项D“但许多让我们今天的生活更容易的东西都是由女性发明的”符合语境。故选D。
22．根据“Let’s take the dishwasher(洗碗机) as an example.”可知，此处是在介绍洗碗机的发明，选项F“它是由一位名叫约瑟芬·科克伦的女士于1886年发明的”符合语境。故选F。
23．根据“So, Josephine decided to try and invent a machine which could wash a lot of plates and glasses safely.”可知，她决定发明洗碗机，选项A“如果没有人会发明洗碗机，那么我会的”符合语境。故选A。
24．根据前句“The car was invented by a man.”和后句“Her name was Mary Anderson.”可知，此处存在转折，选项C“然而，是一位女性解决了驾驶中最大的问题之一”符合语境。故选C。
25．根据“Before her invention appeared, it was impossible for drivers to see where they were going when it was raining or snowing.”可知，在她的发明出现之前，当下雨或下雪时，司机看不清路，所以他们要打开窗户。选项E“他们不得不打开窗户”符合语境。故选E。
26．F 27．E 28．C 29．A 30．D
【导语】本文主要是介绍在体育运动中避免受伤的五个步骤。
26．根据空格下文“Wear protective equipment.”，“Warm up.”和“Know the rules of the games.”可知本文在介绍运动中避免受伤的方法，选项F“采取这些步骤来防止受伤，这样你就可以继续运动。”符合语境，故选F。
27．根据空格下文“Doing some stretching exercises can get you prepared to play sports.”可知开始运动前最好做一些伸展运动，选项E“一进入场地就开始运动不是个好主意。”符合语境，故选E。
28．根据空格上文“This works because drivers know the rules and follow them—at least most of the time.”和下文“When players know the rules of the games, fewer injuries will happen.”可知运动也需要有规则，选项C“运动也是同样的道理。”符合语境，故选C。
29．根据空格下文“They are just about protecting other people.”可知有些规则是为了保护别人，选项A“当心别人。”符合语境，故选A。
30．根据空格下文“But playing when you’re hurt is a bad idea. It can lead to an even worse injury.”可知如果受伤了就不要再运动，选项D“当你受伤时，不要运动。”符合语境，故选D。
31．C 32．E 33．B 34．F 35．A
【导语】本文是记叙文，作者因为自己将嫁给糟老头而忐忑不安，躲进了塑料做的飞船。
31．结合上文“I’m not very brave and I love my parents very much.”。再结合下文“I felt sad for my parents.” 可知上文说说明作者很爱父母，但是却为父母感到伤心。选项C“我从来没想过我会不听他们的。”与之对应，故选C。
32．结合下文“I couldn’t get married to a terrible old man like Buffalo.”可知作者表示不能嫁给Buffalo那样的糟老头。选项E“但是我必须过自己的生活。”与之对应，故选E。
33．结合上文“I knew they would follow me quickly，so I told the spaceship to take me to a very quiet part of the Galaxy，a long way from any planets with people on.”上文提到了宇宙飞船。选项B“宇宙飞船出发了。”与之对应。故选B。
34．结合上文“There are a lot of little black holes in space.” 上文提到了太空中有很多小黑洞。选项F“它们和土豆差不多大” 与之对应，故选F。
35．结合下文“I was in the middle of the Galaxy in empty space.” 上文说作者在银河系中央的一片空白中。选项A“现在没人能找到我了。”与之对应。故选A。
36．C 37．F 38．A 39．E 40．D
【导语】本文是一篇说明文，文章由中国第一只克隆猫引出了宠物克隆这一话题。
36．根据下文“Huang got a new cat that looks almost the same as Dasuan, thanks to cloning technology.”可知，多亏了克隆技术，黄养了一只看起来和Dasuan一模一样的新猫。选项C“但66天后，Dasuan‘回来了’”符合语境，故选C。
37．后文介绍了Dasuan这只克隆猫来自于北京的一家实验室，故选项F“Dasuan是中国第一只克隆猫”符合语境，故选F。
38．本段介绍了世界上第一只克隆猫和克隆狗，由此推测克隆动物并不是一件新鲜事了，选项A“事实上，克隆宠物并不是一件新鲜事”符合语境，故选A。
39．根据下文“Though the cloned pets copy the dead pet’s appearance, they have different characters. That’s why pet owners have different opinions about this.”可知，人们认为克隆宠物只能复制宠物的外貌，但是无法复制性格，人们对此持不同的意见，选项E“然而，也有人反对宠物克隆”在此处起到引出下文的作用，故选E。
40．根据上文“Moreover, scientists think cloned pets aren’t as healthy as naturally born pets.”可知，科学家认为克隆宠物不如自然出生的宠物健康，故选项D“他们的寿命可能更短”符合语境，故选D。
41．D 42．B 43．E 44．A 45．C
【导语】本文主要出现了未来可能出现的三种食物。
41．根据“By the year 2050, the world’s population will reach 9.1 billion. To feed everyone, we may need to change our food in some ways.”可知此处问及未来的食物，D项“未来的食物呢？”符合语境。故选D。
42．根据“Making meat in lab will reduce greenhouse gases.”可知要介绍实验室制作的肉有什么优势，B项“此外，人们可以通过减少脂肪使它更健康。”符合语境。故选B。
43．根据“They don’t need a lot of food and water. They don’t need a big place to live.”可知养昆虫很容易，E项“但是饲养昆虫要容易得多。”符合语境。故选E。
44．根据“Scientists are thinking to add natural ‘seasonings’ in vegetables.”可知这段话主要讲到吃蔬菜，A项“吃蔬菜的聪明方法。”符合语境。故选A。
45．根据“The ‘seasonings’ come from some animals.”可知讲这种调料品对蔬菜味道的影响，C项“它们使蔬菜更好吃。”符合语境。故选C。
46．A 47．D 48．B 49．C 50．F
【导语】本文主要讲述了Adrien Beyk发明的一套可以保暖的智能手套和袜子。
46．根据“They are connected to the user’s smart phone and can be electronically heated at the touch of a button”可知它们连接到用户的智能手机上，只需按一下按钮即可进行电子加热，可见它们很智能，选项A“最重要的是它们是智能的”符合语境。故选A。
47．根据“I want to put what I’ve learned into practice and invent something to help with this”以及“It took him three years to work on this.”可知他想把学到的东西付诸实践，并发明一些东西来帮助解决这个问题，这个东西能在冬天保持温暖，选项D“在加拿大最寒冷的冬天，它们能让我们保持温暖”符合语境。故选D。
48．根据“Some users say it is significantly (显著的) longer than other heated gloves on the market”可知此处说明这副手套的保暖时间比较长，选项B“它们可以在长达6.5个小时的时间里维护用户合意的温度”符合语境。故选B。
49．根据“Accordingly, this advantage has attracted many music lovers.”可知这副手套可以用来演奏乐器，所以吸引了很多音乐爱好者，选项C“此外，它们很薄，可以用来演奏乐器”符合语境。故选C。
50．根据“Beyk said it was his love for computer engineering and fashion that made him interested in starting Quanta Vici”以及“The great imagination has been leading me to better the gloves all the time”可知正是他对计算机工程和时尚的热爱使他对创办Quanta Vici产生了兴趣，他将科技和时尚融合在一起，选项F“这似乎是一个融合时尚与科技的绝佳机会”符合语境。故选F。