All living things on the earth need other living things to live with. Nothing lives alone. Sometimes one living thing kills another to live, so they form a food chain.
Plants make food from sunlight, water, air and so on while some animals on(以……为食) plants directly. For example, locusts(蝗虫) are small insects. Millions and millions of locusts in a group can eat anything that is green, including a lot of food that people need. In India, locusts have ever destroyed(破坏) many fields of crops. However, locusts can be food for birds, chickens, ducks or other living things, even humans.
Humans are at the top of the food chain, they eat not only locusts, but also birds, chickens, ducks or many other plants and animals. They are members of many food chains, but they often break up the food chains.
Each form of life is linked(和……有联系) to all the others. Breaking the links puts all lives in danger. Humans should share the world with other living things in peace.
1. No living things can live alone.2. Some animals eat plants directly to live.
3. Locusts don’t eat food that people need.
4. Humans hardly ever break up the food chains.
5. It’s dangerous for humans to break up the food chains.
相似题推荐
【推荐1】People depend on plants. We use plants for food, cloth, shelter (住处), and even the air we breathe (呼吸).
Plants keep our air and water clean. Green plants give us oxygen (氧气). Oxygen is part of the air we breathe.
Plants are also part of the water cycle (水循环). Most of the water that a plant takes in goes back into the air.
Plants give us a lot of the food on the earth. Fruits, vegetables, and grains (谷物) come from plants. Without plants, we would not have bread, rice, carrots, apples, oranges, or bananas! Many people are growing plants to eat in their own gardens at home. Having your own garden helps the earth as well.
When you grow your own fruits and vegetables, you help cut down on pollution because big trucks don’t need to take your food to shops. You also help reduce the amount of rubbish because you don’t need to use bags for packing your food. You can just pick it out of the ground or off a plant and put it into a basket!
Trees are an important plant resource (资源). Trees provide wood to build homes and furniture. Trees are used to make lots of things around your home and at your school. And trees provide fruits that are good for you. Without trees, the earth would be a very different place.
1. ________ is part of the air we breathe.| A．Sunlight | B．Water | C．Food | D．Oxygen |
| A．It goes back into the air. | B．It stays in the plant. |
| C．It goes into the ground. | D．It stays in the river. |
| A．Cause. | B．Accept. | C．Reduce. | D．Expect. |
| A．A Different Place | B．The Uses of Plants |
| C．Food on the Earth | D．Gardens at Home |
| A．an interesting novel | B．a book about animals |
| C．a popular play | D．a book about nature |
【推荐2】① I love snakes. My mum does not. Lots of people who are afraid of snakes have never even seen one. So where does the fear come from?
② According to scientists’ experiments, it seems that we’ve evolved (进化) this way—faster to see snakes and faster to learn to fear them.
③ People may not be born afraid of snakes, but we are born able to see them quickly. In tests with pictures, people picked out snakes faster than they could find flowers, birds, and rabbits. It wasn’t just snakes, though. People also found spiders (蜘蛛) and angry faces faster than “safe” things like flowers. It seems like we find things that might be threatening to us faster than things that aren’t.
④ People also learn to fear snakes faster than many other things. After all, if we had to be bitten by a snake to learn that it’s dangerous, we might learn our lesson too late. So it’s important for us to fear snakes. And it matters more to nature. People protect animals they like, not animals they fear. Snakes may not be as cute as cats, but they’re just as important to the environment. If we don’t fear snakes, we may choose to kill instead of avoiding them. Our fears help snakes to live safely.
⑤ How can we deal with our fears to give snakes a chance? Scientists did a research recently where students went on a field trip. Guides helped them find and catch snakes in the forest. Everyone can safely touch and hold a snake. It showed that snakes weren’t so bad when you got to know them. Most people who were afraid of snakes before the field trip aren’t afraid now. In fact, snakes even became some students’ favourite animals. Maybe I should take my mum on the next field trip.
根据语篇内容，选择最佳选项。
1. What does the underlined word “threatening” probably mean in Paragraph③?
| A．Natural. | B．Colourful. | C．Dangerous. |
| A．What makes people fear snakes. |
| B．Why it is important to fear snakes. |
| C．How to stop snakes from hurting people. |
| A．By getting to know snakes. |
| B．By telling the fears of snakes to others. |
| C．By choosing snakes as their favourite animals. |
| A．The fears of snakes protect people in a way. |
| B．Everyone will like snakes after joining in a field trip. |
| C．Most people who fear snakes were hurt by snakes before. |
| A．To thank scientists for their effort in the study of snakes. |
| B．To teach people some useful ways to get on well with snakes. |
| C．To encourage people to face their fears of snakes correctly. |
【推荐3】Oink! The Year of the Pig is coming. How much do you know about pigs? Do you like them? Many people don't, because they believe that pigs are naturally fat, lazy and dirty. But are any of those things true?
It is true that pigs are fat. They eat a lot. But they are useful to us. We get more than just pork from pigs. We can use their skin to make shoes. We can use their hair to make brushes. Pigs also provide us with ingredients for drugs like insulin(胰岛素). Insulin can treat diabetes (糖尿病).
People sometimes say. “You are as stupid as a pig.” But pigs are not stupid. In fact pigs are one of the 10 smartest animals. They have a good memory and can tell different shapes apart. Many experts think pigs are easier to train than dogs or cats. In France, people teach pigs to find truffles(松露). With their good sense of smell, they can find truffles even faster than dogs.
When you see pigs, they are usually in dirty water or mud. That's because pigs have no sweat glands(汗腺). On hot days, they have to cool themselves in water or mud. This keeps insects away from them as well. Mud can also protect their skin from sunburns.
These stereotypes about pigs often make us hold a negative(负面的) view about the animal. For example, If someone eats a lot, we say that they have “pigged out”. If someone's room is very messy, we might say his or her room looks like a pigsty(猪圈).
But people in ancient China really liked pigs. People thought the pig's big head and ears were a symbol of good luck. If someone had a round and chubby(胖乎乎的) face, he or she was thought to be blessed(有福气的). People also believed the animal, stood for wealth, as humans use every part of the pig. Piggy banks are a symbol of this. Most children have a piggy bank that they can use to save money.
1. People can use pigs' skin to___________.| A．make clothes | B．make insulin |
| C．make shoes | D．make brushes |
| A．tell one hundred different colors apart. | B．find truffles with their good eyesight. |
| C．be of great help to people like dogs. | D．get away from insects with their owners' help. |
| A．fixed ideas | B．feelings | C．mistakes | D．decorations |
| A．People thought pigs were blessed by God. |
| B．People believed the animal stood for health. |
| C．People knew pigs were one of the 10 smartest animals. |
| D．People thought pigs can bring good luck to them. |
| A．tell that pigs are not stupid, dirty or fat at all. | B．criticize people who don't really know about pigs. |
| C．point out that pigs can do a lot of things for people. | D．help people know more about the pigs. |
【推荐1】Bert won a national prize called Young Heroes for his “green” project. This public-spirited young person was now a university student. His love for insects grew deeper and he was protecting them for the future.
________ When he was around 4 or 5, he always loved to watch different insects, especially beautiful swallowtails (凤蝶). One interesting fact he learned about swallowtails was that their bright colors warned hungry animals that they tasted bad. And it was also fun to watch how they came into being. But the reason he really fell in love with them was that they were very accessible. For example, if you wanted to attract (吸引) swallowtails, you planted some zinnias, a kind of bright flowers.
Bert started a zinnia garden at his house, where he raised a large number of swallowtails over the years. With the world’s swallowtail population falling, Bert wanted people to realize that if insects like swallowtails disappeared, so would all the others above them on the food chain. To make the fact clear and easy to understand for other students, he also created a zinnia garden at his junior high school.
Part of the joy for Bert was watching the younger students get excited when running after swallowtails. “Whenever a swallowtail lands on them, the young students will soon fall in love with these cute insects. They develop a new appreciation for them,” he said.
Bert put his efforts into the environmental educational project and made it take flight.
1. What did Bert do after he was honored with Young Heroes?| A．He often gave speeches in public. |
| B．He set up his “green” project. |
| C．He went on protecting insects. |
| A．Bert saved many swallowtails. |
| B．Bert had a dull childhood. |
| C．Bert found his love early in life. |
| A．dangerous to feed. | B．easy to get close to. | C．hard to raise. |
| A．A Bright Flower | B．A Flying Project | C．A Green Garden |
There are about 3, 000 dolphins living in ocean parks around the world. People love watching them. But do they miss their home? The dolphin in this picture might be able to help them return to the ocean.
A US company built a life — like robotic dolphin. It acts robotic dolphin and sounds like a real dolphin. It can swim for up to 10 hours on a single charge(充电). During tests, people can hardly tell the dolphin is a robot and not real.
The company is now bringing these robotic dolphins to the public. It hopes these dolphins will take the place of real dolphins in ocean parks. Besides dolphins, the company wants to create Great White Sharks and some other animals for ocean parks.
In fact, people who want to protect animals are talking more about the influence of keeping wild animals in parks. The animals have to perform(表演) for visitors many times a day, as well as go through training programs. People around the world are doing more to protect wild animals. Parks and circuses(马戏团) in 20 European countries cannot have wild animal shows anymore. Ocean parks in France can no longer have dolphin shows as of Sep 29. Animal rights groups say the move is “a historical victory”.
1. What can we learn about the robotic dolphin?| A．It is still under discussion. | B．It is just like a real dolphin. |
| C．It can swim over 10 hours on a single charge. | D．It will take the place of real dolphins in the ocean. |
| A．To make more money. | B．To do research into animals. |
| C．To keep the ocean park popular. | D．To help protect wild animals. |
| A．Fewer visitors in ocean parks. | B．More training programs in circuses. |
| C．More wild animals in oceans. | D．No dolphin shows in French ocean parks. |
| A．Create New Inventions | B．Visit Ocean Parks | C．Help Dolphins Go Home . | D．Watch Animal Shows |
【推荐3】
Dolphins are believed to be very intelligent animals. They seem to be able to think, understand, and learn things quickly. Many scientists believe there is a special connection between dolphins and humans. There are lots of amazing stories about dolphins and humans. Here are two of our favourites.
Although dolphins use their brains differently from people, they are similar to humans in a way: both make plans to get something they want. In the seas of southern Brazil, for example, dolphins use an interesting strategy to get food. When fish are near a boat, dolphins show signs to the fishermen to put their nets in the water. Using this method, the men can catch a lot of fish. What is the advantage for the dolphins in doing so? They get to eat some of the fish.
Another story is about dolphins as a lifeguard to help save humans in danger. In 2016, Adam Walker went to New Zealand to swim across the Cook Strait between the North and South Islands. He was swimming when he saw a large dark shape below him. He knew that it was a great white shark and his life was in danger. Adam knew he didn’t have a lot of time. A few seconds later, a group of ten dolphins joined him and swam in a circle between him and the shark. The circle of dolphins kept Adam safe. After half an hour, the shark left, but the dolphins swam with him for another hour.
1. Which word can replace the underlined word “intelligent” in Paragraph 1?| A．huge | B．cute | C．awful | D．smart |
| A．a good helper | B．a brave lifeguard | C．a quick hunter | D．a crazy killer |
| A．To say goodbye to Adam. | B．To ensure Adam’s safety. |
| C．To guide the proper way. | D．To show their friendliness. |
| A．Dolphins—Humans’ Good Friends | B．Dolphins—A Brave Lifesaver |
| C．Dolphins—Sharks’ Natural Enemies | D．Dolphins—A Good Swimmer |
【推荐1】
Thang-ga(唐卡）is a special kind of painting. It was found only in Tibet, China. It started from the Tang Dynasty(唐朝). Thang-ga paintings show Tibetan people’s lives. In recent years, Thang-ga paintings have caught the public’s attention. At the same time, the Chinese government has also tried hard to protect the art.
The color of Thang-ga paintings looks wonderful and special. Because of the special environment of Tibet and the excellent skills of artists, the paints(颜料) used in Thang-ga are different from other paints. They were made from minerals like gold and silver, as well as some plants. The paints were made by hand and the beautiful colors could last for hundreds of years.
However, with the development of technology, people now use cheaper and more easily-made chemicals to make Thang-ga paints. The traditional paints used in Thang-ga paintings took a lot of work and they were made in many secret ways. Later people stopped making the paints and forgot about them. So the skills needed to make them were almost lost. The traditional Thang-ga paintings are difficult to find now.
1. We can learn ________ from Thang-ga paintings.| A．the history of the Tang Dynasty | B．the life of Tibetan people |
| C．how to make Thang-ga paints | D．how people protect the paintings |
| A．gold | B．plants | C．easily-made chemicals | D．silver |
| A．were made in secret ways | B．were made by machine |
| C．were cheaper than the modern ones | D．can be found in Tibet easily |
| A．Thang-ga was found only in Tibet in the Tang Dynasty. |
| B．The colour of Thang-ga paintings can last for long with modern technology. |
| C．The special environment of Tibet makes Thang-ga paints different. |
| D．The skills of painting Thang-ga have been lost already. |
| A．Tibetan painters. | B．How to protect Thang-ga paintings. |
| C．The history of the Tang Dynasty. | D．Thang-ga paintings. |
【推荐2】What problems do the teenagers(青少年) probably have? Here is a survey showing their main problems.
Problems | Causes | Advice |
| Feeling Stressed(有压力的) | Too much homework. Not having enough time for their hobbies. | Make a plan for study and hobbies. Find time to relax as possible as you can. |
| Getting short-sighted(近视的) | Too much homework. Bad reading and writing habits. | Do homework or read in a correct way. |
| Fights | Not knowing how to get on well with classmates. | Make more friends and understand each other. Share your problems with them. |
| Feeling tired of study | Computer games’ bad influence(影响) | Don’t be crazy about computer games. Play them just for short time when you are tired. |
| Getting fat | Having more pocket money to buy snacks. Dislike doing exercise. | Use your pocket money to do something meaningful. Spend some time doing Exercise every day. |
1. How many main problems are there in the survey?
| A．Four. | B．Five. | C．Six. | D．Seven. |
| A．Feeling tired of study and getting fat. | B．Feeling stressed and getting short-sighted. |
| C．Feeling stressed and fighting with classmates. | D．Getting short-sighted and feeling tired of study. |
| A．Do much homework. | B．Give away his pocket money. |
| C．Buy some snacks. | D．Spend time on hobbies and relax |
| A．Maybe he has no close friends. | B．Maybe he has no pocket money. |
| C．Maybe he gets fatter and fatter. | D．Maybe he plays computer games too much |
| A．Playing computer games. | B．Doing less homework at home. |
| C．Learning how to make friends. | D．Paying no attention to each other. |
【推荐3】It’s getting hotter and hotter outside. Summer is already here! Summer means high temperature, more outdoor activities and all kinds of fruit and vegetables. How can we stay fit in this exciting season? Here are some good suggestions:
Eat and drink properly
What is healthy to eat in summer? Fresh and light food. Fish can be a good choice. It can keep your body energetic and help fight against the burning sun. Another good choice is colorful fruit and vegetables. They not only please our eyes, but are full of healthy chemicals (化学物质) .Tomatoes can help protect your skin against sunburn. Blueberries are good for your brain and eyes. The more color, the better!
With all those summertime activities you will be thirsty. What to drink? Water. Water has zero calories (卡路里) and is the perfect drink to stop your thirst (口渴) . Try not to drink too many energy drinks, sports drinks and soda drinks which have lots of sugar and caffeine (咖啡因) in them.
Stay active and cool
Summer is a great season to enjoy outdoor activities and play. It’s also a good time to lose weight. If you are lucky enough to be near a body of water, try water sports like swimming, surfing, water skiing and so on. These sports keep you cool and active at the same time. You’ll have no problem beating the heat and keeping fit as well. Be careful of the sunshine. Summer allows us more chances to get outside, but it also means more possibilities to get burnt by the sunshine. If you are going outside, keep away from the sun when it’s the strongest—usually between 11 a.m. and 3 p.m. If you have to stay in the sun for a long time, sun cream (防晒霜), a big hat and a long-sleeve jacket will be necessary.
1. How many pieces of advice does the writer give us?| A．Two. | B．Three. | C．Four. | D．Five. |
| A．fish | B．tomatoes | C．sun screen | D．sports drinks |
| A．使……愉悦 | B．想要 | C．使……明亮 | D．请 |
| A．Water sports can help you feel cool and active in summer. |
| B．You d better not go outside from 12 a.m. to 2 p.m. in summer. |
| C．Energy drinks are better than water to stop thirst. |
| D．Summer is a good time to lose weight. |
| A．How to Stay Healthy | B．How to Lose Weight |
| C．Enjoy Outdoor Activities in Summer | D．Keep Fit in Summer |
【推荐1】Hello! My name is David. I live with my parents in China.
My mother, Lily, is from(来自) Chongqing, and my father is from Chengdu. His name is Paul .My mom likes Chongqing very much. She says if(如果) you want to eat delicious(美味的)food, you can go to Ciqikou. If you want to go shopping, you can go to Jiefangbei. If you want to see the beautiful night view(夜景), you can go to Laifushi ★ You can go to Kuanzhai Alley(宽窄巷子) to eat delicious food. You can see many pandas in Chengdu. You can go shopping in Chunxi Road, too. I think my parents are fun. I like Chongqing, and I like Chengdu, too.
1. David is Paul's__________| A．brother | B．father | C．son | D．mother |
| A．Ciqikou | B．Jiefangbei | C．Chunxi road | D．Kuanzhai Alley |
| A．You can go to Laifushi to see the beautiful night view. |
| B．You can see many pandas in Chongqing |
| C．You can go shopping in Jiefangbei and Chunxi Road. |
| D．The writer(作者) likes Chongqing and Chengdu,too. |
| A．Chongqing is a great place to go to | B．My mother likes Chongqing more than(超过)Chengdu |
| C．But my father doesn't like Chengdu | D．But my father says it's more(更)relaxing to go to Chengdu |
【推荐2】The National Football League is exciting for many Americans. If you live in the US and don't understand the sport, you can easily feel left out. Here are some tips to help you go from outsider to super fan.
Pick a team to root for
There are 32 NFL teams. Cheering for your hometown team is always a possibility. But if you don't have a team in your city, you can hop on another team's bandwagon（搭上另一队的顺风车）. Although there are different opinions, you can feel the satisfaction of winning almost any given week this way. If you still cannot decide, just pick a team with a cool logo or uniform!
Learn the basic rules
There are two teams, each with 11 players on the field. The team on offense（进攻）aims to run with the ball to the competing team's end zone for a touchdown（触地得分）or kick the ball through the other team's goalposts for a field goal. The team on defense（防守）aims to stop these things from happening or take control of the ball for themselves. The team with the most points at the end wins.
Get into the drama
It's exciting to see powerful players moving the ball forward on offense, and equally powerful defensive players trying to stop them from getting points. The game sometimes causes serious damage to players' brains. "As long as no one gets terribly injured, the hitting is the best part," said Calvin White, a 16-year-old from New York.
Watch the Super Bowl
The Super Bowl is the annual championship game of the NFL. Nearly 110 million viewers will watch this game on TV. Even non-fans don't want to miss the stars show. It's not only a treat for US football fans, but also a global game.
What things do football players have to wear?
American football is a dangerous sport. Players tackle each other to get the ball. Although the competition is exciting, players must have gear（装备）to protect themselves from serious injuries.
根据材料内容选择最佳答案。
1. The team on offense can get points through________.
a. a touchdown b. touching the ball
c. a field goal d. running with the ball
| A．ab | B．ac | C．dc | D．bd |
| A．Offensive powerful players. | B．Defensive powerful players. |
| C．Footballs. | D．Games. |
| A．wearing gear is a tradition | B．wearing gear looks cool |
| C．they may get hurt in the game | D．gear can help players run fast |
A． | B． |
C． | D． |
| A．The basic rules of American football. |
| B．The risks of playing American football. |
| C．The annual Super Bowl game. |
| D．The food people eat while watching the game. |
【推荐3】Once there was a forest where all the animals lived happily together. One day a family went to spend the day in the forest, and the son left his socks there. After the family left, a bear came by, found the socks, and decided to try them on. They fit（适合）so well, and he liked them so much that he wouldn’t take them off.
All the animals talked about the bear’s new look. Soon, in that forest, there began appearing squirrels（松鼠）in shirts, rabbits in shoes, and even rats（鼠）wearing hats! The forest doctor shook his head, telling animals, “This can’t be good. Animals don’t need clothes! "But no one listened to him. They said he was just out of fashion.
However, it wasn’t long before the first results of fashion-fever came. Several times the squirrel caught his shirt on trees, stopping him in mid-jump and sending him falling to the ground from a tree. The rat couldn’t go into his hole without taking off his hat first. Even the bear, because of his socks, slipped（滑到）from the river rock and almost killed himself.
When the animals came to see the doctor, he gave them all the same advice, “Take off those clothes before one day they’re going to kill you.” Those who listened to the doctor’s advice stopped having accidents. And the animals realized that they didn’t need clothes at all. Starting to wear them had been very dangerous, and they had only done it to make others admire（羡慕）them, and to get attention.
1. ________ found the socks and tried them on.| A．The son | B．The bear | C．The rabbit | D．The rat |
| A．the family had a good time with the bear. |
| B．the animals didn’t like the bear’s new look. |
| C．the forest doctor told the animals not to wear clothes. |
| D．the squirrel couldn’t go into his hole with his hat on |
| A．soon the animals had lots of accidents after wearing clothes |
| B．soon the animals became healthier in the warm clothes |
| C．soon the animals enjoyed wearing clothes very much |
| D．soon the animals had a fever because of the clothes |
| A．helping others is helping yourself | B．we should be careful in the forest |
| C．things that fit yourself are the best | D．we must protect animals |
