1 . A team of researchers at Brigham and Women’s Hospital, Harvard Medical School, has developed a system to use a smartphone camera to test for viral infections. In their paper published in the journal Science Advances, the group describes their system, which involves the use of an external microchip device and a smartphone system that uses a trained deep-learning algorithm.
As the pandemic has gripped the world for most of this year, scientists have been looking for ways to slow the spread of the next one. In this new effort, the team has developed a smartphone-based system that can be used by non-medical people to test for a variety of viral infections.
The system is made up of a smartphone, an external microchip device and software. Body fluid samples are placed into a channel on the microchip device, which is then dipped in a small amount of H2O2. The resulting reaction leads to the formation of bubbles. The bubbles develop in unique patterns based in part on viruses in the fluid sample. The user points their smartphone camera at the bubbling sample and starts the deep-learning algorithm that has already been trained to identify the patterns and therefore recognize the presence of viruses. The whole process takes about 50 minutes. The researchers have thus far taught their system to recognize just three viruses, Zika and Hepatitis B and C. But testing shows the system to be 99% accurate. They note that their system is more portable and cost-effective than other solutions in the works.
The researchers suggest that their system could be rapidly trained to recognize new viruses if the need arises, and the microchip device could be sent to hot spots in the future. Such technology, the researchers suggest, could help to stop future pandemics if used widely. The researchers also note that the system could be immediately useful in infection prone areas lacking testing labs.
1. What’s the purpose of the text?| A．To advise people to use a new smartphone camera. |
| B．To introduce the development of deep-learning algorithm. |
| C．To explain the invention of a new microchip device. |
| D．To show a new finding about testing for viral infections. |
| A．To educate ordinary people with medical skills. |
| B．To help prevent the pandemic from spreading fast. |
| C．To try to treat an illness with a smartphone camera. |
| D．To make smartphones more portable and powerful. |
①Bubbles of a liquid sample are formed. ②Samples react with H2O2.
③Fluid samples are collected in a special device. ④Viruses in bubbles are recognized automatically.
⑤The software is started to examine the bubbles.
| A．③②①⑤④ | B．③①②④⑤ |
| C．②③①⑤④ | D．②①③④⑤ |
| A．Indifferent. | B．Doubtful. | C．Confident. | D．Curious. |
2 . Meg. Jo, Amy and Beth live with their mother Mrs. March while their father is fighting in the Civil War. The family doesn’t have much money. They live next door to M. Laurence, who is very wealthy, and his grandson, Laurie. The passage below is about Beth, who loves to play the piano. The March family only has a small, out-of-tune piano. The “Mansion of Bliss” is Mr. Laurence’s house.
But Beth, though dying for the grand piano, could not gather courage to go to the Mansion of Bliss’. She went once with Jo; but Mr. Laurence, not being aware of her weakness, stared at her so hard from under his heavy eyebrows, and said “Hey!” so loud, that he frightened her so much, her feet chattered on the floor, she never told her mother; and she ran away, declaring she would never go there any more, not even for the dear piano. No comfort could overcome her fears, till the fact coming to Mr. Laurence’s ear in some way, he set about mending matters. During one of the brief visits he made, he artfully led the conversation to music, and told such attractive stories that Beth found it impossible to stay in her distant corner, but moved nearer and nearer, as if interested. At the back of his chair she stopped, and stood listening with her great eyes wide open, and her cheeks red with the excitement of this unusual performance. Taking no more notice of her than if she had been a fly, Mr. Laurence talked on about Laurie’s lessons and teachers: and as if the idea had just occurred to him, he said to Mrs. March:
“The boy pays little attention to his music now. But the piano suffers for lack of use. Wouldn’t some of your girls like to run over, and practise on it now and then, just to keep it in tune, you know, madam?”
Beth took a step forward, and pressed her hands tightly together to keep from clapping them and the thought of practising on that splendid instrument quite took her breath away. Before Mrs. March could reply, Mr. Laurence went on: “They needn’t see or speak to anyone, but run in at any time: for I’m shut up in my study at the other end of the house, Laurie is out a great deal, and the servants are never near after nine o'clock.”
Here he rose, as if going. “Please tell the young ladies what I say; and if they don’t care to come, why, never mind.”
“Oh, sir, they do care, very, very much!” Beth finally made up her mind to speak, in her eager yet shy way.
“Are you the musical girl?” he asked, without any frightening “Hey!” as he looked down at her very kindly.
“I’m Beth. I love it dearly, and I’ll come, if you are quite sure nobody will hear me-and be disturbed,” she added, fearing to be rude, and trembling at her own courage as she spoke.
“Not a soul, my dear. The house is empty half the day; so come as much as you like.”
“How kind you are, sir!”
Beth blushed like a rose under the friendly look he wore; but she was not frightened now, and gave the big hand a grateful squeeze, because she had no words to thank him for the precious gift he had given her.
1. According to the passage, Beth’s fear may result from ______.| A．dying for playing the piano | B．her being very weak |
| C．going to Mr. Laurence’s house | D．Mr. Laurence's staring and a loud greeting |
| A．considered Beth as a fly | B．pretended not to see Beth |
| C．didn't notice Beth at all | D．thought more of Beth than a fly |
| A．Because other people in the house didn’t like Beth and Jo at all. |
| B．Because there was nobody in the house when Beth came to play. |
| C．Because he wanted Beth to feel comfortable coming to his house. |
| D．Because Laurie wasn’t at home and Beth had no one to play with. |
a. Mr. Laurence visits the Marches. b. Mr. Laurence talks about music.
c. Beth says she’ll play Mr. Laurence' piano. d. Beth and Jo visit the ‘Mansion of Bliss’
e. Beth listens in a corner. f. Mr. Laurence invites the sisters to play the piano.
g. Mr. Laurence says “Hey!” to Beth.
| A．d-g-a-b-e-f-c | B．d-g-a-f-e-b-c | C．a-g-b-e-f-d-c | D．a-g-d-b-e-f-c |
| A．rude but attractive | B．kind but weak |
| C．friendly and thoughtful | D．mysterious and attractive |
3 . On a trip to India in 2012, Anirudh Sharma took a photo of a diesel generator (柴油发电机) blowing black soot (烟灰) against a white wall. That dark stain made Sharma, who was then a student in the Media Lab of Massachusetts Institute of Technology (MIT), think seriously about pollution—and also about coloring matters, like ink.
The black ink we use in our pens or in inkjet printers is essentially from soot. The technical term for the substance is “carbon black”, and it is the powder that remains after burning coal or oil. The powder is mixed with other chemicals to turn it into smooth, flowing black ink.
“So, if you can do it with soot, can we do the same with air pollution?” Sharma explains. “The black ink in the pen you use is made by burning fossil fuels. But you shouldn’t need to burn new fossil fuels just to make ink. Fossil fuels are already being burned.” If he could find a way, he thought, to catch the soot that produced that stain on the wall in his photograph, he could not only reduce the amount of pollution released into the air, but also turn it into something new, or perhaps something beautiful.
In 2014, following the completion of his Master’s degree at MIT, Sharma returned to India to focus fully on developing what would become a product called AIR-INK, the first commercial ink made entirely from air pollution. He and his team built a lab in a small garage in Bangalore to create a device that could catch air pollution at the source, in engines or factory machinery.
They first developed a filtering device called Kaalink that consisted of a steel container that could be attached to an exhaust pipe. Now Kaalink can filter air pollution from almost any source, and turn it into soot, which is then processed to form ink that can be used in AIR-INK pens and markers. Each marker holds about 30 milliliters of AIR-INK, which is equal to approximately 45 minutes of diesel car pollution.
The inventor would like AIR-INK to have practical applications, like in inkjet printers in offices, newsprint, or textbooks. “We’ve set up industries for our comfort, but the environment has to bear the price of it.” Sharma explains, adding that AIR-INK isn’t a complete solution to the world’s pollution problem. “It’s a start, and it can inspire several others to start looking at new forms of waste that are lying outside, unused.”
1. What inspired Sharma to make ink out of air pollution?| A．A photo he took in India. | B．The lack of ink in his studies. |
| C．The serious pollution in the U.S.. | D．His experiments in the laboratory. |
| A．It is a useful kind of fuel. | B．It is the main air pollutant. |
| C．It is the key component of ink. | D．It is usually in the form of a liquid. |
| A．Soot→exhaust pipe→Kaalink→AIR-INK | B．Soot→Kaalink→exhaust pipe→AIR-INK |
| C．Air pollutants→soot→Kaalink→AIR-INK | D．Air pollutants→Kaalink→soot→AIR-INK |
| A．It needs more tests. | B．It is costly but practical. |
| C．It helps raise environmental awareness. | D．It has gained the admiration of other inventors. |
The Royal Swedish Academy of Sciences awarded the Nobel Prize in Chemistry 2020 to two women scientists, Charpentier and Doudna, “for the development of a method for gene editing."
The discovery of these genetic scissors was unexpected.During Charpentier' s studies of Streptococcus pyogenes, one of the bacteria that cause the most harm to humans, she discovered a previously unknown molecule(分子），tracrRNA. Her work showed that tracrRNA is part of bacteria's ancient immune system, CRISPR/Cas. Charpentier published her discovery in Nature in 2011 and described how tracrRNA works with the Cas9 protein(蛋白质）to follow and kill viruses by cutting up their DNA.
Then in that same year,Charpentier began to cooperate with Doudna, an experienced biochemist in RNA.Together, they succeeded in recreating the bacteria's genetic scissors in a test tube and simplifying the scissors' molecular components so they were easier to use.They then reprogrammed the genetic scissors. In their natural form, the scissors recognize DNA from viruses,but Charpentier and Doudna proved that they could be controlled so that they can cut any DNA molecule at a predetermined site. Where the DNA is cut, it is then easy to rewrite the code of life.
Since the CRISPR/Cas9 genetic scissors were discovered in 2012, their use has exploded though there are concerns that the technology could be misused. This tool has contributed to many important discoveries in basic research, and plant researchers have been able to develop crops that withstand mould, pests and drought. In medicine, clinical trials of new cancer therapies are underway,and the dream of being able to cure inherited diseases is about to come true.
1. According to Charpentier's studies of Streptococcus pyogenes, tracrRNA_____| A．can change life's DNA precisely |
| B．causes the most harm to human beings |
| C．is a previously unknown immune system |
| D．works with Cas9 protein to split viruses' DNA |
a. Charpentier began to cooperate with Doudna.
b. Charpentier published her discovery in 2011.
c.Charpentier studied Streptococcus pyogenes.
d. The bacteria's genetic scissors were recreated.
e.The genetic scissors were then reprogrammed
| A．a-b-d-c-e |
| B．c-a-b-e-d |
| C．a-d-e-c-b |
| D．c-b-a-d-e |
| A．Concerns about the misuse of genetic scissors. |
| B．The widely-spread use of the genetic scissors. |
| C．The important discoveries in basic research. |
| D．Contributions to cure for inherited diseases. |
| A．Cooperation:Secret to Success in Scientific Researches |
| B．Genetic Scissors:a Tool for Rewriting the Code of Life |
| C．Charpentier & Doudna:Women Scientists Acknowledged |
| D．The Nobel Prize in Chemistry: a Promoter of Gene Editing |
5 . Planning to go to a gym? If you are one of those who have spent many days planning to join a gym or to attend it regularly, then why not choose some home exercises? Here are some home exercises without equipment.
Jumping jacks
This one is the best home workout without weights, which is a great exercise that will work your hands and legs. Perform this exercise by standing with your feet placed together and arms at your sides. Now tuck in your abs (收腹) and jump by bending your knees. At the same time, move your feet apart as much as you can and raise your hands to bring into line with your shoulders. While you come back you must be in a starting position, feet together, hands at sides and knees bent. You must land on your heels and again jump.
Jogging
Jogging is one of the best home exercises without weights. You don’t need to have a lawn or jogging track at home to perform this exercise. There are many benefits of jogging. It will work your entire legs. Moreover, it is a classic cardiovascular (心血管的) workout. Make sure you wear jogging footwear even if you are jogging at home to avoid any stress on your feet. Also, you can gradually increase the jogging time and speed.
Rotating (旋转) exercise
Start by rotating your wrists, clockwise (顺时针方向地) and anticlockwise. Now, alternately rotate your feet in the same fashion. Now place both your hands on the shoulders and start rotating your shoulders clockwise and anticlockwise. Place an exercise mat and lie flat on your back. Now lift your left leg and rotate it clockwise; do not bend your knees. Now rest the left leg, lift your right leg and rotate it
Anticlockwise
It is necessary to set a perfect mood for exercise which will help you stick to the exercise routine and excitement. Make sure you wear proper exercise clothes to perform the workout with ease. Also, putting on your favorite music will make your exercise session more lively. If you get bored with exercises, just dance, after all it’s also one of the best home exercises.
1. While jogging at home, you__________.| A．may exercise your body entirely |
| B．had better choose a pair of proper shoes |
| C．should find a space as the jogging track first |
| D．must stick to a fixed time and speed |
| A．Hands-legs-back-legs. |
| B．Wrists-hands-feet-shoulders. |
| C．Wrists-feet-shoulders-legs. |
| D．Hands-shoulders-knees-legs. |
| A．a good mood and atmosphere |
| B．a good coach |
| C．a professional teacher |
| D．a good timer |
6 . Look at the center circles of Diagram A and Diagram B. Which of the center circles looks larger? In Diagram B? In fact, they are exactly the same size.
Then look at the picture on the right. What do you see? A vase? Or two faces？Does the picture change quickly from one to the other again and again? Maybe or maybe not, but you can never see them at the same time.
“What’s happening? Is something wrong with my eyes?” You may wonder at what you see.
Don’t worry. Here is how it goes:
When we look at things, our eyes send messages to our brains and then our brains interpret the information. However, sometimes our brains interpret the received information in a wrong way. It seems that our eyes are playing a joke on us. This often happens and we call it “visual illusion ( 错误)”.
Movie makers often make use of visual illusions. They make the objects around actors much smaller or bigger than usual. This makes us believe that the actors are much larger or smaller than they usually are. The movies Jurassic Park and Honey I shrunk the kids just make use of visual illusions.
1. Why does the center circle in Diagram A look smaller than that in Diagram B?| A．Something is wrong with our eyes. |
| B．The two circles are not the same size. |
| C．The two pictures change quickly from one to the other. |
| D．Our brains interpret the information in a wrong way. |
a. We look at things with our eyes. b. Our brains interpret the messages.
c. Our brains tell us what we have seen. d. Our eyes send messages to our brains.
| A．c a b d | B．a d b c | C．a c d b | D．b c a d |
| A．To make the actors seem different in size |
| B．To make the actors much braver |
| C．To help the actors become stronger |
| D．To help the actors look better |
7 . Shoppers in the United States have many different retail stores (零售店) to choose from. You can shop at large department stores, furniture stores, jewelry stores, electronic equipment stores and many others. Another type of retail store—the catalog store, has become popular in the U.S.
Catalog stores offer much of the same goods as traditional retail stores. However, in these stores, shoppers select the items they wish to buy from large catalogs that are filled with photos and descriptions of all the different goods. The variety of products listed in the catalogs includes everything from baby clothing to video equipment and watches. The prices of these items are very low. In fact, the same items often cost more in other retail stores. And that’s the reason many people prefer to shop in catalog stores.
When shoppers go to a catalog store, they see many brand-name products on display. If they are interested in purchasing an item, they need to follow this simple procedure.
●First, they go to a counter to find the store’s catalog.
●They look in the catalog to find the exact item they wish to buy.
●Then, they fill out an order form with the name of the item, the item number from the catalog, the price, and their name and address.
●After completing the form, the customer gives it to a salesperson, who checks to see if the item is in stock.
If the item is available, the stockroom sends it on a conveyor belt (输送带) to the pick-up counter. When the item arrives at the pick-up counter, the customer’s name is called, and the customer pays for the item.
The whole procedure usually takes ten to twenty minutes. If the item isn’t available, the salesperson can usually check the store’s computer and find out when it will be in stock again.
Catalog stores usually don’t offer all the services that regular retail stores do. They usually don’t have many salespeople, so customers can’t expect to receive much assistance or attention from store employees. Customers need to know about the features and the quality of the items they wish to buy before they shop, since there isn’t much opportunity to ask questions or examine the product in the store. However, catalog stores offer quality items at lower prices, and consumers seem to appreciate this.
1. What is the difference between the traditional retail stores and the catalog stores?| A．The prices of products in catalog stores are higher. |
| B．Shoppers select the items they need from large catalogs. |
| C．Catalog Stores offer more products than the traditional stores. |
| D．Catalog stores usually offer all the services that regular retail stores do. |
①Check the catalog to select the items.
②Fill out the order form.
③Wait at the pick-up counter.
④Find a catalog at a counter.
⑤Find a salesperson to cheek the form.
| A．④-①-③-⑤-② | B．①-④-②-③-⑤ |
| C．④-①-②-⑤-③ | D．④-②-⑤-③-① |
| A．become salespeople now |
| B．do the same as in retail stores |
| C．have more chances to examine the goods |
| D．should know the information of the goods ahead |
| A．offer quality goods at lower prices |
| B．have many salespersons for service |
| C．can help save much time when doing shopping |
| D．offer the exact items the customer wishes to purchase |
We were both in great anger. “Never set foot in this house again!” stormed father. With tears welling up in my eyes, I rushed out of the flat and ran along the street.
The street lights were shining, causing rather sad-feeling. I wandered aimlessly.
A young father who held a child in his arms walked past me. I felt as if I saw my childhood from another space: happy and carefree.
But now … I don’t know whether it is because I have grown up or because dad is getting old. We differ in our ways of thinking. He always put his opinions and codes of behavior on me. Whenever I do something wrong, he never admits it. We are just like two people coming from two different worlds. It feels like there is an iron door between us that can never be opened.
I wandered the streets, without a destination in mind. My heart was frozen on this hot summer night. As I walked on there were fewer and fewer people on th e streets, until I had only the street lights to keep me company. When I finally reached the high-rise apartment block in which I lived , I saw that the light was still on.
I thought to myself: “Is father waiting for me, or is he still angry with me?”
In fact, it was nothing. Perhaps, dad was throwing away some of his old stamps. Perhaps he thought they were useless. I never had the courage to tell him that I liked collecting stamps. I can’t stand his outrageous(蛮横的)words: “I can’t throw you away, let alone these old papers?”
All the lights were off except father’s.
Dad was always like this. Maybe he didn’t know how to express himself. After shouting at me, he never showed any mercy or any moments of regret. After an argument he has the habit of creeping up in my sleep and then tucking me underneath the covers.
This was how he always was. He has been a leader for so long that telling everyone else what to do has become his second nature.
The light was still on. “Am I wrong?” I whispered, maybe… With the key in hand, I was as nervous as I had ever been. At last, I decided to open the door. As soon as I opened the door tears ran down my cheeks. I suddenly realized that the iron door that I had imagined between us did not exist(存在) at all. Love—it second to none.
1. Decide which is the best order of the following according to what happened in the passage.
a. I opened the door and entered the house.
b. Sadly I ran out into the street.
c. I reached the place where I lived and saw my house still brightly lit.
d. I thought of my father’s kindness towards me.
e. I walked about in the street without any aim.
| A．b, e, d, c, a | B．b, e, c, d, a |
| C．b, e, a, c, d | D．b, e, c, a, d |
| A．The sight of the street lights. |
| B．The sight of the empty street. |
| C．The sight of a father with a child in his arms. |
| D．The sight of light in his own house. |
| A．perhaps the father is getting older and older. |
| B．perhaps the son has already grown up. |
| C．perhaps they never agree with each other. |
| D．perhaps the father has got used to doing that. |
| A．The father treats his son in an unfair way. |
| B．The father is actually kind to his son. |
| C．The father is neither kind nor cruel to his son. |
| D．The father is always finding fault with his son. |
9 . We can express thoughts and feelings and send sounds and pictures on our smartphones today. We also communicate using programs like Skype and Face Time. We can’t send tastes, smells or touch like people do in the real world, of course. Professor Adrian David Cheok at City University in London is trying to develop a way for smartphones to do just that.
To give users a sense of taste, researchers designed two electrodes (电极) that are placed on the tongue. A chemical process creates different tastes through molecules (分子) on the surface of the tongue. This chemical process sends electrical signals that convince the brain that a person is tasting something. They have already created sour, salty, sweet and bitter tastes. “You put your tongue between these two silver electrodes and then it stimulates your tongue electrically and you get a virtual taste sense in your brain.”
A device called Scentee permits users to have the sense of smell. Scentee plugs into a smartphone and can spray (释放) tiny clouds of fragrances (气味), including flowers, fruit and coffee. Professor Cheok says the person speaking can activate the device. “Basically what happens is that we have an app, it connects to the Internet and then this will release a scent from your mobile phone.” Scentee holds a container with about 100 different smells. The container must be replaced when all the scents run out.
The sense of touch comes from a ring-like device. It is connected wirelessly to the smartphone. The device sends a soft, electrical squeeze (挤压) when a person on the other end of a telephone conversation does the same. Professor Cheok says this permits a kind of wireless touch communication. “I can be in London and my friend can be in Tokyo, and I can squeeze my finger and then he’ll get a squeeze on his finger through the Internet. It’s a way of touch communication with small mobile devices.”
1. Which of the following functions of smartphones is NOT referred to in the text?| A．Sending tastes. |
| B．Sending smells. |
| C．Sensing the owner’s feelings. |
| D．Touching people you are communicating with through the phone. |
①A chemical process creates different tastes on the tongue.
②Put the tongue between the two electrodes.
③The tongue is stimulated electrically.
④The chemical process sends electrical signals to the brain.
| A．①②③④ | B．③④①② | C．②③①④ | D．③①②④ |
| A．Adjust. | B．Encourage. | C．Promote. | D．Operate. |
| A．explain a new kind of technology |
| B．describe some future uses of smartphones |
| C．show the effects that smartphones have on people |
| D．advise people to keep in close contact through smartphones |
10 . For the 17 years my life was very happy. Then the first sad thing happened. My mother became very ill, and soon she knew that she was dying. Just before she died, she asked Elizabeth and me to go to her room. She held our hands and said, “Victor and Elizabeth, my children, I’m very happy because you love each other, and because one day you’ll get married. Everyone in the family loves you, Elizabeth. Will you take my place in the family, my dear? I can die happy if you look after them when I have gone.”
My mother died and we were very sad, because we loved her dearly. Elizabeth was brave and helped us; her sweet smile gave us some happiness in the unhappy days after my mother’s death. The time came for me to go to university. I didn’t want to leave my sad family, but we all knew that I should go. It was hard to leave, too, because the parents of my good friend Henry would not let him go to university with me. So I had gone alone.
On my first day at university I met my teacher, Professor Waldman, who was one of the greatest scientists in the world. He gave a wonderful talk to all the students who were starting at the university. He ended his talk by saying, “Some of you will become the greatest scientists of tomorrow. You must study hard and discover everything that you can. This is why God made you intelligent—to help other people.”
After the professor’s talk, I thought very carefully. I remembered the storm when I was 15; I remembered how the lightning had destroyed the tree. From then on, I wanted to use electricity to help people, and I wanted to discover the secrets of life. I decided to work on these two things.
I started to work the next day. I worked very hard and soon Professor Waldman and I realized that I could learn to be a very good scientist.
The professor helped me very much, and other important scientists who were his friends helped me, too. I was interested in my work and I did not take one day’s holiday during the next two years, I did not go home, and my letters to my family were very short.
After two years, I had discovered many things and I built a scientific machine that was the best in the university. My machine would help me answer the most important question of all. How does life begin? Is it possible to put life into dead things? To answer these questions about life I had to learn first about death. I had to watch bodies from the moment when they died and the warm life left them. In the hospital and in the university, I watched the dying and the dead. Day after day, month after month, I followed death, so it was a dark and terrible time.
I built a tall mast about 150 meters high, which is higher than the tallest building in the city, to catch lightning and send the electricity down to my machine in the lab. I believed I could use that electricity to give life to things that were dead.
Then one day, the answer came to me. Suddenly I was sure that I knew the secret of life.
1. Which of the following is TRUE according to the passage?| A．Victor did not want to leave his family because his mother died not long before. |
| B．Elizabeth married shortly after Victor’s mother died. |
| C．Elizabeth was a brave girl who loved Victor and gave him much help. |
| D．Victor’s mother was very angry when she knew he loved Elizabeth. |
| A．he discovered many things and built a scientific machine |
| B．he learnt much about death both in the hospitals and in the university |
| C．he built a tall mast to catch lightning and send the electricity down to the lab |
| D．he worked hard and took only one day’s holiday during the next two years |
| A．use electricity to cure diseases |
| B．build the best machine to learn about death |
| C．become the greatest scientist of tomorrow |
| D．give life to things that were dead by using electricity |
① Victor’s mother passed away.
② Victor got help from the professor and other scientists.
③ Victor went to university and attended the professor’s talk.
④ Victor found the answer to giving life to things that were dead.
⑤ Victor experienced a storm, seeing the lightning destroying the tree.
| A．①②③④⑤ | B．⑤①③②④ | C．①③②⑤④ | D．⑤①②④③ |
