Does it really matter if we know how old animals are? To many scientists, it does.
When studying animal populations, it is very important for scientists to know how many animals there are and how old they are. This information can help scientists learn which animals are thriving (兴旺) and which ones need more care and help. Scientists usually use the following ways to tell animals’ age.
For many animals, their teeth can help scientists know their age. In some animals, some teeth don’t come in until a certain age. Take cows for example. Like humans, cows have two sets of teeth, milk teeth and permanent teeth (恒牙). They normally get their first pair of permanent teeth when they’re two years old. Then they have the next pair at age three, the third pair at age four...
Hair and skin (皮肤) can also provide information about age. Some animals will possibly get bad skin and gray hair as they get older. If you have an older dog, you may have noticed that its nose and mouth get grayer as it gets older.
Scientists are continuing to discover new and more ways of telling the age of animals. Recently, scientists learned that they could tell the age of humpback whales (座头鲸) by examining their DNA. That’s really good news!
1. Scientists study the populations of animals to know which animals can live the longest.2. Cows normally get their first pair of permanent teeth when they’re three years old.
3. As dogs get older, they might get grayer noses and mouths but their skin remains the same.
4. Scientists made a new achievement in telling the age of animals by examining their DNA.
5. The passage mainly introduces some scientific ways to tell animals’ age.
相似题推荐
Thanks for visiting the Shanghai Zoo. There are many animals in the zoo.
Look! Here are the zebras. They come from Africa. They like to eat leaves and grass.
| A．But they don’t eat meat. |
| B．They are popular(受欢迎的) animals in Australia. |
| C．Let’s see koalas(考拉) first. |
| D．They come from America. |
| E．So some people don’t like them. |
| F．My favourite animal is fish. |
| G．So you can have a good time here! |
Chinese pandas meet the public(公众) in the World Cup host country
Now Soccer fans from all over the world can enjoy the World Cup games in Doha (多哈), the capital of Qatar (卡塔尔).
On November 17, Doha’s first-ever panda house opened to the public, CGTN reported.
The pandas arrived in Doha on Oct 19.
| A．It was the first time that pandas had been to the Middle East. |
| B．It is the new home of two Chinese giant pandas. |
| C．The fans can also say hello to giant pandas from China. |
| D．The pandas may not like the food there. |
| E．The two Arab names mean stars in the sky. |
| F．They can travel around the country too. |
| G．The pandas enjoy their life in Doha. |
【推荐3】Jane Goodall is a famous scientist. For more than 40 years, Goodall lived mostly in Tanzania in East Africa, studying chimpanzees (猩猩).
As a young child, Jane Goodall was interested in animals. She grew up in the English countryside and was always climbing trees or riding horses.
When Jane Goodall was 23, she got a chance to go to Africa. Even though she had never been to college, she got a job with a famous scientist named Louis Leakey.
One day, Louis Leakey said he needed a volunteer. He needed someone to go to a lake in Tanzania to study a kind of chimpanzees. Jane was excited.
On July 16, 1960, she began her exploration (探索). At first, the chimpanzees ran away from Jane. But with time passing, they got used to her being around.
Every day, Jane would follow the chimpanzees, taking notes on their behavior. She learned many new things about chimpanzees. She watched how a chimpanzee made a tool.
She learned how some chimpanzees became good leaders. She watched how mother chimpanzees raised their children. She watched animals get angry and get upset... She wrote everything down so others would understand animals as she did. She learned that if you pay really close attention to animals, you will understand what they are “saying”.
1. What is the correct order of the following according to the passage?a. Jane went to Africa. b. Jane started her exploration.
c. Jane worked with Louis Leakey. d. Jane was born in the countryside.
e. Jane followed chimpanzees.
| A．d-a-e-b-c | B．b-a-c d-e | C．a-d-c-b-e | D．d-a-c-b-e |
| A．Tanzania is a country in West Africa. |
| B．Jane studied the chimpanzees only from the books. |
| C．Jane got on well with the chimpanzees in the forest. |
| D．Jane got a job with Louis Leakey because she was an excellent student in the university. |
| A．animals don’t get excited | B．chimpanzees can make tools |
| C．people can communicate with animals | D．mother chimpanzees raise their children |
| A．All roads lead to Rome. |
| B．All good things come to an end. |
| C．All work and no play makes Jack a dull boy. |
| D．All the great achievements come from years of hard work. |
【推荐1】Dino has a dream. He wants to be a taikonaut. But what’s life in space like? Do taikonauts sleep well? Do they watch TV? What do they eat? Let’s learn something about their lives in space.
Grow taller
There is no gravity in space. This means that the spines(脊柱) of taikonauts get longer.
Float in space
We walk on the Earth. Taikonauts float in space. Since there is no gravity, they can float between the aircraft(航空器) and the space station(太空站). They swim in the air like fish in water.
What do they eat?
Do taikonauts eat pizza in space? No.
Do they sleep well?
Sleeping in space is very different. Taikonauts sleep in the air. This sounds like a lot of fun! The space station travels around the Earth every 90 minutes.
How do they wash?
There is very little water in space.
Taikonauts also watch TV in space. They also send emails to others and read news on the Internet. They spend most of their time looking out from the space station. Through the windows they can see the beautiful blue planet—the Earth.
| A．Do they watch TV? |
| B．The taikonauts see sunrise(日出) and sunset(日落) 16 times in 24 hours. |
| C．They can grow 2.5 cm to 5 cm taller in space. |
| D．All the food taikonauts eat in space has no water. |
| E．What do they do for fun? |
| F．That means every drop of water is precious(珍贵的). |
【推荐2】What’s inside your daddy’s wallet? Some coloured notes and some plastic cards. These are called “money”. People use money to buy food, clothes, toys, etc.
A long time ago, people didn’t buy things. They swapped them. For example, Jack could swap（交换）some vegetables with Jeff to get some meat in return.
Then, people started to use things like shells and salt as “money”. Later, people started to make metal coins and paper notes.
As time went by, people found it hard to go around with a lot of notes and coins. So they put their money in a safe place called a “bank”. A bank keeps our money safe, and gives us a plastic card to pay in shops. Today, we also pay with our phones. This is called e-money （电子货币）!
1. Long long ago, people ________.| A．put their money in a bank | B．used money to do shopping |
| C．swapped things with each other | D．made coloured notes as money |
| A．E-money. | B．Metal coins. | C．Paper notes. | D．Shells and salt as “money”. |
| A．It sells plastic cards. | B．It makes paper notes. |
| C．It helps us buy things. | D．It keeps our money safe. |
| A．People don’t use paper money at all. | B．People can use their phones to pay today. |
| C．It is easy to go around with a lot of notes. | D．Our phones are getting cheaper and cheaper. |
The invention of barcodes（条形码）is based on a very simple idea. We only need to give each product a specific number and print it.
Each number in a barcode is shown by seven blocks of the same size.
A barcode includes different parts and each one provides a specific meaning. The first part of a barcode tells you the country where the product was made. For example, 690—692 is the barcode for China.
| A．Then computers can read it directly. |
| B．All information can be shown by barcodes. |
| C．The next part tells you who produced the product. |
| D．And “nine” looks similar to “six” if you turn it upside down. |
| E．Even if you turn it upside down, it isn’t similar to any other number. |
| F．These are colored either black or white to show the number zero to nine. |
【推荐1】What is your first impression of bamboo in China? Is it only a kind of plant on the food list of pandas? No! It also represents single bamboo drifting（独竹漂）, an intangible cultural heritage（非物质文化遗产）passed from generation to generation among the people in Guizhou Province.
Single bamboo drifting has been performed for more than 2,000 years. In the past, the ancestors who lived on the bank of the Chishui River used it as a method to go across the river. Now, with the development of modern transportation, this skill has been regarded as a sport or a unique way of performance by local people.
Middle school students of the province practice the sport and compete in the Chinese National Games. The requirements of the sport are simple, yet demanding! Athletes have to balance on a bamboo pole, barely as wide as one’s foot, and guide it down the river with a thin stick. But there’s more than just guiding. While keeping balance on the narrow bamboo pole with the thin stick, the athletes are performing skills and tricks. Jumping, push-ups, and splits（劈叉）are some of the most common ones, whereas those who are more experienced often use their imagination to try out more difficult moves.
Yang Liu, a 25-year-old “water fairy” from Zunyi, Guizhou, dancing on the river in traditional Chinese costume, is an inheritor（继承人）of single bamboo drifting. For over ten years, combining drifting with dancing, Yang has put fresh energy into this traditional art. It’s not easy to stand, let alone dance on a single bamboo. So not surprisingly, Yang has experienced countless falls and failures. Thanks to her efforts, though, single bamboo drifting has gotten great fame on the Internet and become well-known in the world.
1. What did we mainly use single bamboo drifting for in ancient times?| A．A kind of sport. | B．A way of dance. |
| C．A form of traditional art. | D．A type of transportation. |
| A．严苛的 | B．繁琐的 | C．宽松的 | D．自在的 |
| A．To try out difficult moves. | B．To guide and balance. |
| C．To perform different tricks. | D．To practice and compete. |
| A．She was a fairy with magical power. | B．She kept practicing for over 10 years. |
| C．She was good at the skill from the start. | D．She didn’t like the traditional art. |
| A．The spread of sports spirits. | B．The development of tourism. |
| C．The popularity of Chinese festivals. | D．The continuous efforts of generations. |
In our everyday life, we take many things for granted. Being able to see is one of them. However, not everyone in the world has good vision(视力).
The World Health Organization(WHO) has released its World Report on Vision. It says that 65 million people could get their vision back with a cataract(白内障) operation, but cannot get one because they have little or no healthcare where they live. In addition, over 800 million people have trouble doing everyday activities because they don’t have enough money to buy a pair of glasses.
For example, there are thousands of nearsighted African drivers who have difficulty seeing people walking across the road. This makes it dangerous for them to drive. And there are coffee farmers in Bolivia who find it hard to see their ripe(成熟的) beans because of cataracts. This means they can’t harvest(收获) as many beans.
This is mainly a problem in low-income countries, such as western and eastern sub-Saharan Africa, according to the report. A lack of eye care services is one of the main reasons for this.
In southern Asia and other places around the world, there are still cultural barriers(隔阂) when trying to get glasses. In some places, people believe wearing glasses will make one’s eyes worse. In other places, when kids start wearing glasses, their grandparents will say they are for rich people and not for village boys or girls, Public Radio international reported. These beliefs and attitudes must change before more kids can get glasses and improve their vision.
1. The WHO recently released a report about ______ around the world.| A．cataract operations | B．vision problems | C．eye care services | D．types of glasses |
| A．people with cataracts will go blind | B．there is no eye care in African countries |
| C．too much work can cause vision problems | D．people with poor vision face many difficulties |
| A．wearing glasses makes them look ugly | B．only rich people can afford to buy glasses |
| C．wearing glasses can make their eyes worse | D．wearing glasses goes against their cultural beliefs |
| A．Can We Stop Blindness? | B．What Causes Low-income? |
| C．The Poor Eye Care Service Problem. | D．Why do We Need to Protect Our Eyes? |
【推荐3】Are you a fan of the FIFA (国际足联) World Cup? The international football competition (比赛) is held every four years. In 2022, the 22nd World Cup was held in Qatar. It’s the first time that FIFA moved the competition from its traditional summer to winter. Let’s look at some interesting facts about the World Cup!
Mascots (吉祥物)
There is an official (官方的) mascot for each World Cup. The design of the mascot often shows the culture of the host country. World Cup Willie was the first mascot at the 1966 FIFA World Cup. Willie was a lion with grey hair, wearing the national flag of the UK. The mascot for Russia in 2018 was Zabivaka, a wolf with red shorts and a blue and white T-shirt. Its name means “the goal scorer”. The mascot for the 2022 World Cup La’eeb looked like the white headscarf worn by many Arabic people.
Paul the octopus (章鱼)
Paul was an octopus. Before the 2022 FIFA World Cup, Paul’s keeper gave it two food boxes with flags (旗帜) on it. Paul chose one of them to open and ate it first. People saw the first one as his prediction (预测) for the winner. Surprisingly, its eight predictions for the 2022 FIFA World Cup were 100% correct!
1. When will be the next FIFA World Cup?| A．In 2023. | B．In 2025. | C．In 2026. | D．In 2027. |
| A．spring | B．summer | C．autumn | D．winter |
| A．The UK. | B．Russia. | C．Qatar. | D．Arabia. |
| A．the octopus’ keeper was called Paul |
| B．each box stood for (代表) a football team |
| C．the octopus knew which football team would win |
| D．Paul predicted successfully for the 2022 World Cup |
| A．To share the fun facts about the World Cup. |
| B．To tell us the 22nd World Cup took place in Winter. |
| C．To get more people to watch the games during the World Cup. |
| D．To tell us that Qatar was the host country of the 22nd World Cup. |
【推荐1】Camp George, a summer camp in Canada, started in 1998. It provides campers with a place to build lifelong friendships.
Seven years ago, when I first got on the camp bus of Camp George, I didn’t know anyone. People soon started to talk to me and I felt welcomed soon. It wasn’t long before I brought my best friend to Camp George. My best friend and I were close before camp but camp brought us closer.
My camp friends are so special. Everyone is welcome into our friend circle. We share funny jokes and create good memories that we will have forever. We eat together and sleep in a large room. Not only do I have a strong friendship with the girls in my camp, but I also get along well with the trip organizers. The close relationship that we build in the summer lasts forever.
I see my camp friends a lot during the year even though we don’t go to the same school. We understand each other and never get sick of each other. On our camp group chats we count down the days till we go back on the camp bus for a new camp year.
Camp is my home away from home and one of the main reasons I am coming back to camp for my seventh summer is my friendship with my best friends. There is no fighting at Camp George and if you ever feel sad about something, all of the girls will help you in the nicest ways. These girls are my sisters and I don't know what I would do without them.
1. How did the writer feel when she first got on the bus of Camp George?| A．Excited. | B．Sad. | C．Surprised. | D．Bored. |
| A．They both got ill. | B．They went to different schools. |
| C．They knew each other better. | D．They decided to take more trips together. |
| A．They tell each other funny things. | B．They help the trip organizers a lot. |
| C．They cook and eat together. | D．They talk about their memories of the summer. |
| A．What the campers’ school life is like. | B．How campers help each other. |
| C．How campers get sick. | D．How campers look forward to the next camp. |
【推荐2】In the USA, there is a little girl called Hilde Lysiak. She is young, but lots of people know her. They like the young girl because she is so special. She makes a monthly newspaper by herself. So far, she has had about 50 subscribers(订阅人) who are interested in her newspaper. Do you want to get to know the special girl?
Hilde Lysiak is 8 years old and she lives in Selinsgrove, Pennsylvania. She is interested in writing. She dreams of making her own newspaper. Now her dream comes true.
Her newspaper is called Orange Street News. She writes all of the articles, takes the photos, and even sends the newspaper to her readers. Her articles are usually about fires, meetings, sports, movies and other important events.
Her father, Matt, is a reporter. Hilde Lysiak makes her newspaper with the help of her father. He often helps her do the layout(排版) of the newspaper. She wants to show her gratitude to her father.
1. Hilde Lysiak was interested in ________ when she was young.| A．reading | B．writing | C．singing |
| A．Making more money | B．Making her newspaper | C．Being a reporter |
| A．Her father | B．Her mother | C．Her teacher |
| A．感激 | B．愤怒 | C．心情 |
| A．Hilde Lysiak lives in the USA |
| B．Hilde Lysiak takes the photos by herself |
| C．She learns to print her newspaper |
1. Mrs. Brown had a _________ behind her house.
| A．shed | B．small garden | C．an apple orchard | D．small house |
| A．the summer | B．the winter | C．the autumn | D．the spring |
| A．the summer | B．the winter | C．the autumn | D．the spring |
| A．morning | B．afternoon | C．evening | D．night |
| A．monkeys | B．ducks | C．pigs | D．chickens |
