Have you ever wondered why we can’t remember things from when we were under 3 years old? There are a couple of reasons why our early memories might disappear.
Firstly, our brains are still developing when we’re very young. Although our brains have about 100 billion neurons (神经), the connections between them aren’t fully stable (稳定) until around the age of 3. So, some memories might not stick because the brain’s network isn’t fully built yet.
Another reason is that our brains are like busy organizers, always sorting through information. When we’re very young, our brains gather all kinds of memories, but not all of them are important for staying alive or everyday life. So, to keep things tidy and make room for new, more important information, our brains might let go of those early memories.
Some scientists also think that because babies are still learning language, they might not store memories in the same way older children and adults do. Without words to connect to experiences, these early memories might be harder to remember later on.
However, not all early memories disappear. Sometimes, if something really big happened when we were very young, we might keep a bit of that memory. Researchers have found that with the right triggers (触发器), like a specific smell or sound, people can sometimes remember these early memories.
So, while we might not remember every detail from when we were babies, our brains were busy learning and growing, making sure we kept the most important memories and skills we needed.
1. What’s it mainly about from paragraphs 2 to 4?| A．Brain growth from birth to 3 years old. |
| B．How we use language to remember things. |
| C．Reasons why we might forget early memories. |
| D．How smells and sounds help us remember. |
| A．By how happy they make us. | B．By how important they are for our daily life. |
| C．By how colorful they are. | D．By how much noise is in them. |
| A．We remember everything from our baby years. |
| B．No information is important for babies’ brains. |
| C．Our brains are fully grown when we’re born. |
| D．Some early memories can return with the right triggers. |
| A．They’re too sad to remember. | B．To make room for new, important information. |
| C．Those memories aren’t useful. | D．We have too many brain neurons. |
| A．In a science book. | B．On a food menu. | C．In a music magazine. | D．On a sports website. |
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【推荐1】Tomatoes taste great. With a lot of vitamins, they are good for you, too! People all over the world enjoy this amazing fruit.
Not all tomatoes are red. They can be yellow, orange, pink, or white. All tomatoes are green before they are ready to be picked. Then the tomatoes turn their true color. That’s when they’re ready to eat!
Tomatoes first grew in the Americas. The Incas grew them over 1,000 years ago. They were introduced to Europe by the Spanish in the early 16th century. The Spanish and Italians seem to have been the first Europeans to accept them as food. In France, people grew tomatoes in the garden just to enjoy their beauty. Many people there thought tomatoes would make them sick. It was years before some of them would eat tomatoes.
Tomatoes are fruits. They grow from seeds. They won’t grow in cold weather. But with water, sunlight and warmth, tomatoes grow fast. They can grow in pots or in the ground. As the plant grows taller, people may tie it to a stick. Next is the blooming stage. Flowers appear. The flowers turn into fruit. Some kinds of tomatoes can be picked in about six more weeks. Some tomatoes are large. One kind of tomato can weigh as much as two pounds.
You can eat raw tomatoes. First, wash them. Then, cut them up for salads or sandwiches. Tomatoes can be cooked, too. They can be grilled, boiled, or even fried. Do you use ketchup? It is made from tomatoes. Tomatoes don’t have a smell. But they taste great in foods around the world. Many dishes from India use tomatoes. Spaghetti sauce and pizza from Italy use them, too. Raw tomatoes are in Mexican salsa.
1. From the passage, we know that tomatoes ________.| A．can grow in all weathers | B．grew in Europe first |
| C．come in different colors | D．have a special smell |
| A．some people in France | B．some people in Italy |
| C．some people in Inca | D．some people in Spain |
A． | B． | C． | D． |
| A．It tells us the value of tomatoes. | B．It is about growing great tomatoes. |
| C．It is about Incas and tomatoes. | D．It is all about tomatoes. |
【推荐2】Does rain make you sleepy? If so, you’re not alone! Many people say the sound of raindrops hitting the window can put them right to sleep. In fact, people often turn on recordings of the sound of rain to help them fall asleep at night. Why does rain have this influence on people?
There are a few reasons why a rainy day might make you sleepy. One is the lack of sunlight. When sunlight shines on the human body, it makes people feel more awake and cheerful. The lack of light on a rainy day can have the opposite influence—people may feel sleepy or a little depressed.
The sound of rain also plays a part. Rain is pink noise. A study found that pink noise reduces brain waves. Experts believe this makes it a possible sleep aid. Rain isn’t the only example of pink noise in nature. Other examples include blowing leaves, wind, and the sound of your own heartbeat.
Of course, rain isn’t the only type of weather that has an influence on the human body. During the winter months, many areas see less sunlight. Many people experience low spirits during this time. Have you ever noticed that more people get sick during cold months? That’s because illnesses like the flu grow and spread easier when it’s cold outside.
The opposite is also true. People often experience lower blood pressure in summer. Increased sunlight can lead to a mood boost（情绪提升）. Some researchers also believe spending time outside on a pleasant day can increase creative thinking.
So if you’re lucky enough to have sunny weather today, try spending some time outside! You never know how it could influence your mood.
1. What does the underlined word “depressed” in paragraph 2 probably mean?| A．Sad. | B．Excited. | C．Happy. | D．Energetic. |
| A．It can make people feel tired. | B．It is a kind of man-made sound. |
| C．It may help people fall asleep. | D．It can only be heard by humans. |
| A．In summer, many areas see less sunlight. |
| B．Illnesses don’t grow when it’s cold outside. |
| C．In winter, more people are likely to get sick. |
| D．Only rain can have an influence on the human body. |
| A．Have enough sleep. | B．Go out and enjoy the sun. |
| C．Pay close attention to ourselves. | D．Record and listen to natural sounds. |
【推荐3】Do you know 5G? It is the fifth generation (代) of mobile network technology. These new networks are coming.
China just issued commercial licenses (发放商用牌照) for 5G on June 6. This means that China’s telecom companies were soon able to offer 5G networks for mobile phone users.
Each mobile network generation is faster and more powerful than the one before it. 1G let us talk to each other. 2G let us send messages. 3G gave us data and the Internet. And 4G made all of these things faster. What’s special about 5G?
5G has a very short delay between sending and receiving information. Now, 4G takes about 100 to 200 milliseconds (毫秒) to send and receive data. But 5G will get it down to 1 millisecond or less—this is almost real-time.
This big change will not only make our mobile Internet faster, but also deeply change our lives. Read on to find out how.
5G+entertainment (娱乐)
5G networks are about 100 times faster than 4G. This means you can dowload a movie in seconds using 5G.
Also, virtual reality (VR) games will become more popular with 5G. The short delay of 5G will make the games feel even more real.
5G+transportation
5G will also bring us safer self-driving cars. These cars can send signals (信号) to each other. They also talk to traffic lights and road sensors (传感器). 5G will allow cars to react even faster than human drivers.
5G+smart homes
5G also makes the Internet of things possible. Internet of things is a large network that connects everything to the Internet. Smart homes are part of it.
For example, your toaster can automatically (自动地) start making breakfast after your alarm rings. And if its sensor feels the air becoming dry, a smart sprinkler could water your plants by itself.
1. What does the underlined word “delay” in Paragraph 4 probably mean in Chinese?.| A．延时 | B．暂停 | C．断开 | D．卡顿 |
| A．entertainment | B．transportation | C．smart homes | D．health |
| A．Mobile phone users can use 5G networks. | B．Each mobile network generation has their own advantages. |
| C．5G will change our lives in many ways. | D．5G will bring us safer self-driving cars. |
【推荐1】Drowning is the second leading cause of accidental deaths of children, so a lot of parents are already signing them up for summer swim lessons.
Studies show they help save lives. According to USA Swimming, formal lessons reduce the possibility of drowning by nearly 90%.
Afton Kidman knows the dangers that come from water. “We shouldn’t only want our kids to think water is fun,” Kidman said. “They also need to know how to survive（存活）in it.”
Kidman’s son, Forrest, was in a drowning accident. He survived but suffered brain damage, and it’s why Kidman decided to learn how to teach survival swimming and became a teacher at Children Swimming Center.
“I wanted to be able to help more kids,” Kidman said. She’s taught nearly 50 of them so far. Some babies are as young as six months. This summer, she has 30 more children coming for lessons. “Every parent should have your child learn how to swim,” Kidman said, “it’s a great gift to give them.”
“Across the country, more than a million kids will learn to swim this summer,” Ruth Comer, with YMCA of Greater Des Moines, said. “Kids who are disabled or have special needs, anyone can learn to swim. It’s never too late.”
“I think it’s going to get a lot of kids that never would have had a chance to get swim lessons, that chance to get in a pool,” Ethan Johnson, head coach of the Des Moines Swimming Federation, said. “If we save one life, it’s all worth it.”
1. The underlined word “they” in the second paragraph refers to “________”.| A．parents | B．swim lessons | C．studies | D．children |
| A．she wanted to earn money. |
| B．she wanted to save her son. |
| C．she was good at swimming. |
| D．her son suffered from drowning. |
| A．To ask more kids to have swim lessons. |
| B．To tell people how to survive in the water. |
| C．To explain the reasons of accidental deaths of children. |
| D．To show why Kidman decided to be a swimming teacher. |
| A．Travel guide | B．Science report |
| C．Sports magazine | D．Business advertisement |
【推荐2】
To many students, joining social media “circles”(社交圈) is now more important than making new friends in real life. And it’s easy. If you have a mobile phone, you can download many Apps such as Weibo, QQ and WeChat.
“I love to check my friends’ updates(更新). I also enjoy news and jokes shared on social media,” said Wang Wei, a 14-year-old student. While enjoying these, Wang distances himself from real life. “I love playing the plane-shooting game on WeChat, but have no interest in playing chess with my classmates,” said Wang.
Deng Yunyun, 14, said that social media has influenced their normal life. Last month, his school held a basketball match, and a student hurt his leg instead of giving him some help, students were busy updating their blogs about the accident. “I think they need to balance (平衡) their real and online lives, and what worries parents and teachers a lot is safety,” said Deng.
“Many students are happy to tell their interests and personal information to their social media ‘friends’. And this could bring them danger,” said Miss Wang, a teacher from Shenzhen. “For example, WeChat’s shake-shake function allows users to connect to other users nearby.” Also the police warn about the risks of making friends in this way.
When enjoying so much fun on social media, we still need to keep safety in our mind.
1. Many students think _______ is more important than making friends in real life.| A．studying hard | B．joining social media “circles” |
| C．playing basketball | D．having a meal with family |
| A．Reading news on the newspaper. | B．Playing some kinds of games on WeChat. |
| C．Being busy talking with friends. | D．Staying at home to watch TV programs. |
| A．Because his classmates were busy updating their blogs. |
| B．Because their classmates didn’t care about him. |
| C．Because he didn’t belong to their social media “circles”. |
| D．Because there were few students there at that moment. |
| A．WeChat’s shake-shake function |
| B．having no interest in playing chess with friends |
| C．caring too much about their social media “circles” |
| D．sharing interests and personal information online |
| A．WeChat’s shake-shake function adds risks. |
| B．Students should not use WeChat. |
| C．Social medias are bad for students in some ways. |
| D．Joining social media “circles” is not important. |
【推荐3】It is not easy for people to sail around the world in quite small boats. Sometimes the weather gets bad. Accidents can happen easily and quickly.
One family once had an accident. A big fish swam under their boat and bit holes in it. Sea water came, in and the boat soon sank（下沉）. Luckily these people had another small boat -a lifeboat, so they all got into the lifeboat. They stayed in the boat for many days. They ate, slept and always hoped. At last people in a ship saved them.
How do people live in a very small lifeboat for a long time? They must be strong in every way. They must have a hope, and they must have a strong desire（愿望） to live. People can’t drink sea water. If they drink a lot of sea water, they will quickly die. They must collect rainwater and drink it. They must also catch fish and birds for food. Lifeboats do not often carry cookers. So people can’t cook their food in the lifeboats. Raw fish and birds are not very nice but they are their only food. They must eat raw food, or they will die.
1. One family once had an accident at sea because ________.| A．no one knew how to sail | B．a fish bit holes in their boat |
| C．they met bad weather | D．their boat hit a rock |
| A．food | B．a bed | C．a cooker | D．a hope |
| A．sea water | B．rainwater | C．dirty water | D．sweet water |
| A．The only food that people can buy. | B．Clean and delicious food in lifeboats. |
| C．Fish and birds that are not cooked. | D．Nice fish and birds that people feed. |
| A．it’s not interesting to sail around the world |
| B．fish in the sea are always dangerous |
| C．we must have a strong desire to live when we are in danger |
| D．what will happen when sailing in a boat |
