Some earlier studies had found no clear color preference among mosquitoes. One study found they prefer blue, another that they prefer yellow-green. What should people make of such conflicting results?
The apparent color of an object doesn’t just depend on the wavelengths of light it gives off, Claire Rusch explains, who studies mosquitoes for years. It also can be affected by the brightness of that light and its contrast against surrounding colors. Humans see an object’s color largely in terms of the wavelengths of light it gives off. But other creatures’ eyes may be more sensitive to contrast or brightness. “We needed to control all of those variables to really be sure a mosquito’s preferences came from the wavelength of the object,” Rusch says.
To do this, she designed a test chamber (室) that was 450 mosquito-body-lengths long in her experiment. Lined with cameras, it recorded the insects’ flight patterns. Two small colored disks laid on the floor of the chamber.
Since the researchers wanted to know if mosquitoes were attracted to certain colors, the disks couldn't be the darkest or brightest objects in the chamber. Otherwise, it would be unclear if the mosquitoes were attracted to the disks’ color, contrast or brightness. So, the researchers projected a chessboard pattern onto the floor of the chamber and gray along the walls. That way, if the mosquitoes went to the colored disks, it could only be due to the disks’ color.
The researchers released about 50 starved mosquitoes into the chamber at a time. Because mosquitoes don't start hunting until they’ve sensed CO2, so the team sprayed (喷) CO2 inside the chamber. They found before CO2 was sprayed, the mosquitoes ignored all the colored disks. With CO2, mosquitoes ignored any disk that was green, blue or purple. But the insects did fly toward disks that were red, orange or light blue. They seemed to especially like red.
To further investigate that, the team placed disks with different skin tones. But the mosquitoes didn't seem to prefer any particular skin colors. All were equally attractive.
1．What can be inferred about mosquitoes from the first two paragraphs?| A．The wavelengths determine the color of an object. |
| B．The background color affects mosquitoes’ eyesight. |
| C．Mosquitoes’ eyes are not sensitive to color contrast. |
| D．Testing their color preference is not so easy. |
| A．The length of the chamber. | B．The number of mosquitoes. |
| C．The brightness of the disks. | D．The pattern of the chessboard. |
| A．To take clearer photos of mosquitoes. | B．To stimulate mosquitoes to look for food. |
| C．To slow down the speed of mosquitoes. | D．To raise the temperature in the chamber. |
| A．Cool colors can drive mosquitoes away. |
| B．Skin colors are mosquitoes’ favorite. |
| C．People in red may attract most mosquitoes. |
| D．All colors are equally attractive to mosquitoes. |
A Great Way to Teach Children to Take Responsibility
As parents, one of the most important things to teach children to take responsibility is to include chores as a part of their daily routine. In order to make a family function smoothly, every member must contribute. Teaching your children to take responsibility at an early age makes it easier for them to shoulder greater responsibilities as they grow older.
Make rewards and punishments a part of the lesson. Together decide whether they will be rewarded or not.
Children need to be taught that there are punishments for their actions in case of not doing their assigned chores. Decide and agree from the start what the punishment will be.
Teaching your children the importance of contributing to the family is of great importance.
| A．A chore is a specific task a child has been assigned which helps improve the life of the entire family. |
| B．And what punishment they will receive if a chore isn’t done. |
| C．Actually you are taking a critical step in empowering them for their future. |
| D．Start by teaching children the difference between a chore and cleaning up after themselves. |
| E．Teach children the importance of each assignment, and why it matters. |
| F．Children will not be rewarded at all for merely cleaning up. |
| G．And if so, what the reward will be for a job well done. |
| A．Meeting neighbors. | B．Making a request. | C．Introducing university life. |
| A．His course material. | B．Long hours of studying. | C．The dog’s barking. |
| A．Polite. | B．Insistent. | C．Helpless. |
Robert and Henry were two friends in the same class. They always played together and went home together. One day Robert and Henry were going home from school, when, on turning a corner, Robert cried out, “A fight! Let’s go and see!”
“No,” said Henry. “Let’s go quietly home and not meddle(干涉) with this quarrel. We have nothing to do with it and may get into trouble. Also our parents are expecting to have lunch with us together at home and I don’t want them to worry about me.”
“You are a coward(胆小鬼), and afraid to go,” said Robert, and he ran off. Henry went straight home, and in the afternoon went to school as usual.
But Robert had told all the boys that Henry was a coward, and they laughed at him a great deal. From then on, they looked down upon Henry and didn’t want to play with him together.
Henry was sad but he wasn’t angry with Robert for his rude behavior, because he learned that true courage was shown most in bearing misunderstanding when it was not deserved, and that he ought to be afraid of nothing but doing wrong. Thus, he just ignored the other boys’ laughter and continued to go to school and study as well. However, Robert didn’t invite Henry to go home with him anymore. Instead, he had some other boys who also thought Henry was a coward. Every day after school, they didn’t go home directly but went to the river or somewhere to play games and had a lot of fun.
A few days later, Robert was bathing with his new friends in the river, and got out of his depth. He struggled, and screamed for help, but in vain. The boys who had called Henry a coward got out of the water as fast as they could, but they did not even try to help him.
Robert was fast sinking.
Thus, Robert’s life was saved.
“I’m going to miss you so much, Poppy,” said the tall, thin teenager. He bent down to hug his old friend goodbye. He stood up, hugged his parents, and smiled, trying not to let his emotions(情绪) get the better of him.
His parents were not quite able to keep theirs under control. They had driven their son several hours out of town to the university where he would soon be living and studying. It was time to say goodbye for now at least. The family hugged and smiled through misty eyes and then laughed.
The boy lifted the last bag onto his shoulder, and flashed a bright smile. “I guess this is it,” he said. “I’ll see you back home in a month, okay?” His parents nodded, and they watched as he walked out of sight into the crowds of hundreds of students and parents. The boy’s mother turned to the dog, “Okay, Poppy, time to go back home.”
The house seemed quiet as a tomb without the boy living there. All that week, Poppy didn’t seem interested in her dinner, her favourite toy, or even in her daily walk. Her owners were sad too, but they knew their son would be back to visit. Poppy didn’t.
They offered the dog some of her favourite peanut butter treats. They even let her sit on the sofa, but the old girl just wasn’t her usual cheerful self. Her owners started to get worried. “What should we do to cheer Poppy up?” asked Dad. “We’ve tried everything.”
“I have an idea, but it might be a little crazy,” smiled Mum. “Without anybody left in the house but us, this place could use a bit of fun. Let’s get a little dog for Poppy.”
It didn’t take long before they walked through the front door carrying a big box. Poppy welcomed them home as usual but when she saw the box, she stopped. She put her nose on it. Her tail began wagging(摆动) ever so slowly, then faster as she caught the smell.
Dad put the box on the ground and opened the top.
A few weeks later, the boy arrived home from university.
Sometimes it may seem difficult to improve our health. If so, the following health habits may help you.
Research shows that if you eat a meal in the morning you may not become too fat or eat too much during lunch. Eating breakfast can help people feel better through the day.
Get enough sleep.
Take a walk every day.
Walking is an easy way to exercise.
Join social groups.
Social groups can provide support. They might include sport teams, art or music groups. The people in the group can offer advice and can help each other in difficult times. Also, being in a group keeps your mind active.
A hobby could be running, reading or making something with your hands. Hobbies help people to relax and rest. Hobbies bring us joy as well.
| A．You'd better meet friends for a walk, not for a meal. |
| B．Poor sleep can influence our memory and learning |
| C．Eat breakfast every morning. |
| D．Eating lunch is beneficial to your health. |
| E．An active mind is a healthy mind |
| F．Have a hobby. |
| G．Everyone should get into good eating habits. |
“Oh my God, buy it!” I believe that you are very familiar with Li Jiaqi’s phrase. Livestreaming marketing is a method of selling products on live video streaming platforms, which are now mainly Taobao, Kuaishou and Douyin. On April 1st, 2020, Luo Yonghao finished his first livestreaming marketing on Douyin. Data showed that the total amount of payments reached 110 million yuan in 3 hours, which set the record of livestreaming marketing on Douyin.
One of the most popular functions of livestreaming is the “real-time connection”. Although traditional television shopping channels also allow viewers to instantly buy recommended items, they don’t allow hosts to respond to real-time comments, nor can television sales data be readily collected to analyze customers’ purchasing behaviors or performance indicators. With this feature, potential customers can get answers to pressing questions and gain a more comprehensive impression of the products, making promotional activities more convincing and effective.
Under the influence of the current epidemic, online shopping reduces direct contact between folks, having a certain guarantee for the health of residents. At the same time, many industries are hit by the epidemic. In this situation, many businessmen walked into the studio with the aim of recovering some of the damage for the business as much as possible.
Meanwhile, the expanding of 5G has created a favorable environment for livestreaming marketing. Supported by the technology of 5G, the image quality of the live stream is clearer, so more details can be showed to customers, which helps to provide them an entirely different experience. “With the arrival of the 5G era, livestreaming will be faster, allowing users to zoom in and out of videos to see more details of products,” said the general manager for e-commerce content at Taobao.
When my little sister Indi turned six, she started
One afternoon my friend Mareya and I were making bracelets(手链).“What are you doing?”Indi asked,
Later, Mareya suggested playing the guitar. I didn’t want Indi to
I disliked the shadow(影子)that didn’t belong to me，but I also felt
Now I still remember Mareya’s words and feel less upset about Indi’s behavior. Anyway, she should be treated with
| A．correcting | B．copying | C．admiring | D．inspiring |
| A．putting | B．writing | C．sitting | D．looking |
| A．refused | B．waited | C．accepted | D．asked |
| A．well | B．much | C．apart | D．close |
| A．room | B．freedom | C．options | D．opinions |
| A．nervous | B．impatient | C．excited. | D．curious |
| A．gradually | B．finally | C．exactly | D．hardly |
| A．support | B．surprise | C．follow | D．recognize |
| A．But | B．So | C．Or | D．Until |
| A．proud of | B．impressed with | C．unfamiliar with | D．tired of |
| A．tears | B．life | C．trust | D．joy |
| A．if | B．though | C．before | D．since |
| A．positive | B．sorry | C．powerful | D．confused |
| A．understand | B．challenge | C．learn | D．change |
| A．confidence | B．humor | C．anger | D．respect |
Maybe there is a Father Christmas!
Anna stood anxiously staring at the pouring rain while little Molly looked up at a pretty doll in the window of the toy shop on the edge of town. "Mummy, "Molly said, "that's the doll I would like Father Christmas to bring me." A tear rolled down Anna's cheek and she knew it would be impossible this year. They were supposed to start a new life in Spain one and a half years ago before her husband Tim was cruelly taken from them by a car. Their small amount of savings were quickly spent on Tim’s funeral costs and necessities, leaving her in heavy debt.
To her relief, the local people had helped to support her through these difficult times and especially Juan, owner of the local grocery store, a single man, who would often put something special into her shopping bag, even though he himself had been going through a difficult period — his mother died of cancer and he was busy handling the sale of his mother’s house on the edge of town.
As the rain stopped, Anna and Molly started walking home. She was thinking about buying an umbrella after paying the rent with her upcoming wage when Molly shouted excitedly, "Mummy, what’s that on the road?" Anna looked down and saw a bag lying in the water, which was obviously lost because of the sudden rain.
They got home and dried themselves before Anna focused on the bag. Opening it and seeing bundles of money inside, she stood back in shock and cried, "Is this a present from kindness? I can pay off my debt, buy Molly’s favorite doll and my new umbrella ...” Then reality set in, Anna was a very moral person and would never steal even the slightest little thing, let alone bundles of money. She went to bed with all thoughts in her mind.
Magnet (磁铁) fishing is a new trend in which a heavy-duty magnet is pulled through a body of water to see what metal objects can be brought to the surface, And while most of these treasure hunters find common items like cans, nails and bicycles, some lucky people have been able to find something surprising.
George Tindale, a 15-year-old with an adventurous spirit, searches riverbeds for lost treasures as a hobby. One lucky day, he struck gold when his heavy-duty magnet pulled out a safe (保险箱) containing thousands of dollars. Then he surprised everyone by tracking down the safe’s rightful owner and returning the safe to him.
George made his unbelievable discovery one day when he was searching the River With am in Grantham, Lincolnshire, with his father, Kevin. They both enjoy magnet fishing: using a strong magnet to pull lost metal objects out of river and ocean depths.
When George and Kevin’s magnet found a heavy object, the curious pair pulled it out to see what they had discovered. They wiped years of river sand and mud from a small safe and forced it open.
Inside, they found some wet business documents, an old wallet and a bag containing $2,500. Further check discovered that the safe also contained several bank cards, which listed the name they needed to track down the rightful owner. After some online searching, they learned that a local businessman of the same name, Rob Everett, reported his safe stolen 22 years ago. George and Kevin helped right the wrong 22 years later.
George and Kevin found Rob through his current business. Shocked that someone had found his safe 22 years after it had been stolen, Rob made plans to meet George and Kevin in his office.
The owner of the safe told them the story of how it got lost.
Rob was so impressed with George’s honesty that he would offer him a job.
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