1 . Scientists have shown how plants can protect themselves against genetic (基因的) damage caused by environmental stresses. The growing tips of plant roots and shoots have an in-built mechanism (机制) that spells cell death if DNA damage is detected, avoiding passing on faulty DNA.
Plants have small populations of stem cells (干细胞) at the tips of their roots and shoots, which enable them to continuously grow and produce new tissues throughout their lifetime. These stem cells serve as ancestors for plant tissues and organs. However, any genetic faults present in the stem cells will continue to exist and be passed on permanently throughout the plant’s life, which could last thousands of years.
Given the critical role of stem cells and their exposure to potentially dangerous environments at the growing tips of roots and shoots, safeguards are necessary to prevent stem cell faults from becoming fixed. Researchers Nick Fulcher and Robert Sablowski, funded by the Biotechnology and Biological Sciences Research Council, aimed to uncover these protective mechanisms. Through experiments involving X-rays and chemicals, they discovered that stem cells were more sensitive to DNA damage compared to other cells.
When DNA damage occurs, the cells have the capacity to detect it and cause programmed cells to die, preventing the propagation of the damaged genetic code to the rest of the plant tissues. This process has similarities to the safeguard mechanism found in animal cells, which has been broadly studied due to its relevance in preventing cancer.
The identification of a similar protective system in plants is of great interest in the field of plant development. It also helps scientists develop plants that can better handle environmental stress. So knowledge of how plants deal with these stresses is of fundamental significance to agricultural science’s response to climate change.
1. What is the function of the in-built mechanism in plants?| A．To produce more roots and shoots. | B．To increase the overall lifetime of the plant. |
| C．To enhance plant growth and nutrient intake. | D．To stop genetic faults in stem cells passing on. |
| A．They are relatively abundant in quantity. | B．They are resistant to environmental stresses. |
| C．They make quick response to DNA damage. | D．They have the ability to repair damaged DNA. |
| A．Spread. | B．Change. | C．Existence. | D．Self-repair. |
| A．The way of dealing with climate change on the earth. |
| B．The significance of identifying the protective system in plants. |
| C．The method of ensuring plant survival under environmental stress. |
| D．The urgency of developing plants that can handle environmental stress. |
2 . In Canada, you can find dogs, cats, horses, etc. in almost every family. These are their pets. People love these pets and have them as their good friends.
Before they keep them in their houses, they take them to animal hospitals to give them injections (注射) so that they won’t carry disease. They have special animal food stores, though they can get animal food in almost every kind of store. Some people spend around two hundred Canadian dollars a month on animal food. When you visit people’s houses, they would be very glad to show you their pets and they are very proud of them. You will also find that almost every family has a bird feeder in their garden. All kinds of birds are welcomed to come and have a good meal. They are free to come and go and nobody is allowed to kill any animal in Canada. They have a law against killing wild animals. If you killed an animal, you would be punished. If an animal happened to get run over by a car, people would be very sad.
People in Canada have many reasons to like animals. One of them might be: Their family ties are not as close as ours. When children grow up, they leave their parents and start their own life. Then the old will feel lonely. But pets can solve this problem. They can be good friends and never leave them alone.
1. The passage mainly talks about ________.| A．how to keep disease from pets | B．pets in Canada |
| C．how to take good care of pets | D．life of the old in Canada |
| A．the pets are sick | B．the pets are wild |
| C．they want to stop them from carrying disease | D．they want them to sleep on the way home |
| A．hate animals | B．often kill animals | C．love animals | D．don’t keep pets inside houses |
| A．they don’t love their parents any more | B．they can only find jobs far from their parents |
| C．their parents’ houses are too small | D．they wouldn’t depend on their parents any more |
3 . Scientists say baby sharks are at risk of being born smaller and without the energy they need to survive because of warming oceans from climate change.
Scientists studied epaulette sharks, which live off Australia and New Guinea. They found that warmer conditions expedite the sharks’ growing process. That meant the sharks were born earlier and very tired. The findings could be used in the study of other sharks, including those that give birth to live young.
The scientists studied 27 sharks. Some were raised in average summer water temperatures, about27 degrees Celsius. Others were raised in higher temperatures around 29 degrees Celsius and 31 degrees Celsius. They found that the sharks raised in the warmest temperatures weighed much less than those raised in average temperatures. They also showed reduced energy levels.
Epaulette sharks can grow to a length of about one meter. Their name comes from large spots on their bodies that look like decorations on some military clothing.
One study this year found that worldwide numbers of oceanic sharks and rays dropped more than70 percent between 1970 and 2018. Overfishing is a main concern, while climate change and pollution also threaten sharks.
Carolyn Wheeler is a doctoral student at the University of Massachusetts Boston and with the ARC Centre of Excellence for Coral Reef Studies at James Cook University in Australia. She is the lead author of the epaulette shark study. She said that while all the sharks survived, those raised in warmer temperatures were not strong enough to survive for long in the wild.
She added that if the sharks are born smaller than usual, they are probably going to have to start looking for food sooner, and they’re going to have less time to adjust to their surroundings.
The study should serve as a warning to ocean governing agencies that careful management is needed to prevent the loss of more sharks.
1. What does the underlined word “expedite” in paragraph 2 mean?| A．Accelerate. | B．Slow. | C．Cause. | D．Influence. |
| A．By studying former data. |
| B．By tracking sharks in the wild. |
| C．By collecting information about climate change. |
| D．By comparing sharks in waters of different temperatures. |
| A．They are named after a military officer. |
| B．They can’t adapt to new surroundings quickly. |
| C．They are dying mainly because of climate change. |
| D．They would die soon after birth in warmer temperatures. |
| A．The reasons for sharks’ loss. | B．The measures to preserve sharks. |
| C．The function of the government. | D．The warnings about the endangered sharks. |
4 . While they can’t pick out precise numbers, animals can comprehend that more is, well, more. From birds to bees and wolves to frogs, animals use numbers to hunt, find a mate, return to their home, and more. Researchers believe that this ability, known as numerical competence, plays an important role in how animals make these decisions. Andreas Nieder, a biologist at the University of Tübingen, explores the current literature on how different animals comprehend numbers.
Honeybees, for instance, can remember the number of landmarks they pass when searching for food in order to find their way back home. This ability can also be seen in animals choosing a larger amount of food over a smaller amount or in animals forming hunting groups. Wolves are more likely to hunt successfully if they have the right number of wolves in their pack for their prey (猎物) with prey like elk (驼鹿), only around six to eight wolves are needed, while hunting wild pigs requires a pack of nine to thirteen. Their prey also uses this concept to protect themselves—elk tend to live in small groups, which rarely have encounters with wolves, or gather in large groups to reduce the chance of any individual becoming prey. “They are assessing the number of individuals in their groups for their everyday life situations,” Nieder says.
Furthermore, numerical competence also plays a role in attracting a mate. For example, male frogs sing “advertisement” calls to attract females. The females, listening to their complicated calls, choose the males that sing the most “chucks” in their calls.
Now researchers do have some sense of the rules that govern numerical competence in animals. For example, they count approximately (大概) rather than specifically and two numbers need to be more different for them to tell them apart as those numbers get bigger. However, Nieder argues that more research needs to be done. “I hope I can encourage behavioral ecologists to specifically explore numerical competence in the wild, and, in doing so, also open new research fields,” he says.
1. What do the examples of wolves and elk suggest about numerical competence?| A．It gives animals a reproduction benefit. | B．It affects animals’ chances of survival. |
| C．It is decided by animals’ hunting ability. | D．It develops well in social animals. |
| A．By listing figures. | B．By asking questions. |
| C．By giving examples. | D．By making comparisons. |
| A．Its fundamental rules. | B．Its appeal to behavioral ecologists. |
| C．Researchers in new study fields. | D．Expectations for further studies. |
| A．Animals’ understanding of numbers gives them an advantage |
| B．Numerical competence research achieves a breakthrough |
| C．Animals develop numerical competence? Never |
| D．Can many animals count? Better than you |
5 . For Aravind Tharunsri and Thaaragai Aarathana, every day is Environment Day and every hour is Earth Hour. And they are on a mission to
Thaaragai was never afraid of water. She started floating even when under one. Being a passionate diver, Aravind always wanted to make his daughter
Now, Thaaragai can call attention to the issue of
The eight-year-old girl
Thaaragai hopes more kids can join. “Why wait for Ocean’s Day or Environment Day? Every day is important when we
| A．clean up | B．focus on | C．make up | D．make out |
| A．accept | B．abandon | C．quit | D．learn |
| A．thrilled | B．disappointed | C．qualified | D．excited |
| A．eventually | B．suddenly | C．frequently | D．relatively |
| A．dangerous | B．extinct | C．energetic | D．endangered |
| A．intention | B．responsibility | C．attention | D．memory |
| A．broke | B．kept | C．witnessed | D．set |
| A．protection | B．pollution | C．development | D．damage |
| A．treated | B．completed | C．celebrated | D．proved |
| A．ignore | B．deal | C．manage | D．value: |
| A．bought | B．collected | C．packed | D．threw |
| A．diver | B．dancer | C．singer | D．swimmer |
| A．switch | B．connect | C．raise | D．compare |
| A．swim | B．compete | C．go | D．fight |
| A．reluctant | B．determined | C．patient | D．talented |
6 . A new study by scientists at Utrecht University concludes that about half of global wastewater is treated, rather than the previous estimate of 20%. Despite this promising finding, the authors warn that treatment rates in developing countries are still very low.
Humans and factories produce vast quantities of wastewater per day. If not properly collected and treated, wastewater may severely threaten human health and pollute the environment.
The authors use national statistics to estimate volumes of wastewater production, collection, treatment and reuse. “Globally, about 359 billion cubic metres of wastewater is produced each year, equivalent to 144 million Olympic-sized swimming pools,” says Edward Jones, PhD researcher at Utrecht University. “About 48 percent of that water is currently released untreated. This is much lower than the frequently announced figure of 80%.”
While the results show a more optimistic outlook, the authors stress that many challenges still exist. “We see that particularly in the developing world, where most of the future population growth will likely occur, treatment rates are falling behind,” Jones explains. “In these countries, wastewater production is likely to rise at a faster pace than the current development of collection and treatment basic facilities. This poses serious threats to both human health and the environment.”
The main problem, especially in the developing world, is the lack of financial resources to build basic facilities to collect and treat wastewater. This is particularly the case for advanced treatment technologies, which can be extremely expensive. However, the authors highlight potential opportunities for creative reuse of wastewater streams that could help to finance improved wastewater treatment practices.
“The most obvious reuse of treated wastewater is to increase freshwater water supplies,” Jones states. Treated wastewater reuse is already an important source of irrigation water in many dry countries. However, only 11% of the wastewater produced globally is currently being reused, which shows large opportunities for expansion.
“But freshwater increasing is not the only opportunity,” says Jones. “Wastewater also has large potential as a source of nutrients and energy. Recognition of wastewater as a resource, opposed to as ‘waste’, will be the key to driving improved treatment going forward.”
However, the authors stress the importance of proper monitoring of wastewater treatment factories, accompanied by strong legislation (法律) and regulations, to ensure that the reuse of wastewater is safe. The authors also acknowledge public acceptance as another key barrier towards increasing wastewater reuse.
1. According to the author, the meaning of treating wastewater lies in ________.| A．encouraging new scientific findings |
| B．estimating volumes of wastewater production |
| C．ensuring human health and protecting the environment |
| D．measuring how much wastewater is produced globally per day |
| A．equal | B．harmful | C．useful | D．friendly |
| A．treated wastewater can’t be used as irrigation water |
| B．wastewater production in developing countries is falling |
| C．the treatment of wastewater is more serious than estimated |
| D．public recognition plays an important role in wastewater reuse |
7 . Have you ever enjoyed a trip to a zoo, but wondered whether it is acceptable for humans to keep so many treasured animals in cages. You are not alone. Many people concerned about the fate of zoo animals and feel conflicted about the very existence of zoos. However, there is no reason to worry.
Most zoos around the world provide the highest level of care and cleanliness for their animal residents. In fact, animals in zoos often experience far healthier lives than they would in the wild due to the access to medical care.
Zoos provide opportunities for people of all ages to view and connect with animal life that they would otherwise not encounter. By interacting with wild life, people can gain a greater appreciation for the animals of the world. Zoos offer educational experiences through which people can learn why it is so important to protect and maintain the diversity of animal life on Earth.
Zoos also function as places where these often rare or endangered animals can be studied. By keeping and raising animals in cages, extensive research can be conducted on the animals to help scientists understand them. This scientific understanding, in turn, contributes to conservation efforts around the world. Because zoos are a safe place for animals to be observed, scientists are able to make important discoveries about their lives.
While it is true that not all zoos are as well maintained and equipped, there is growing international pressure for universal regulations that will ensure the monitoring of all public zoos. This type of legal support will allow the world’s zoos to continue their important research programs, many of which are adjusted toward breeding programs designed to make more endangered species come in. Breeding programs are essential to continue certain species which are nearly wiped out from the wild, and zoos are the ideal place for these programs to promote the increase of the animals. In this manner, zoos contribute to restoring balance in the wilderness by giving endangered species a second-chance at survival.
If you visit a top-ranking zoo, you will enjoy viewing animals in a habitat designed to support their health. You can rest assured that by supporting such zoos as a visitor, you are also supporting valuable science and conservation efforts. Your interactions with the animals and exhibits might educate you further about creatures in parts of the world you haven’t been exposed to.
When people are inspired, they tend to take action more readily, and zoos are an inspiring example of this truth. Zoos provide an unforgettable experience in appreciating animal life and take concrete action towards advocating for their future.
1. According to the passage, most zoos ________.| A．worry about the fate of rare and treasured animals |
| B．create ways for people to observe and learn animals’ life |
| C．provide poor care and unclean environment for the animals |
| D．educate people to try their best to control the diversity of animals |
| A．public zoos around the world are all monitored |
| B．only the endangered animals should be kept in zoos |
| C．visiting zoos contributes to protecting endangered animals |
| D．Top-ranking zoos allow visitors to study animals’ habitats |
| A．critical | B．cautious | C．supportive | D．anxious |
| A．Are Zoo Animals Healthy? | B．Are Zoos Really Bad News? |
| C．Why Should We Study Animals? | D．Should Animals Be Kept in Cages? |
8 . The most obvious dog fetish (迷恋) today is the longing for cuteness. Almost every day you can see adorable pictures of dogs and other animals that will make you smile and say, “How cute!”
It is a cultural phenomenon that the media scholar James Meese calls the “cute economy” which exists primarily on social media, is user-generated, and is heavily dominated by pictures of animals, especially pets. The goal is to generate a positive response, probably followed by a tap on the screen to “like” and “share”. We can click through image after image of cute animals doing cute things, feeling a little boost of good cheer.
The marketing researchers have identified some of the most common categories of cuteness in online pet content: animals doing silly things; animals of extreme size; animals with unusual looks; and animals behaving in ways that seem human-like. Dogs and other animals in the “cute economy” are often further humanized by being dressed in clothing and accessorized (装饰) with hats, jewellery, nail polish and fur dyed a rainbow of colors. Users who post successfully and with some strategies can make money by doing so. Thus, certain dogs have become cuteness celebrities, with millions of devoted followers and paid content from advertisers.
Unfortunately, the price of the “cute economy” comes at a serious cost. The cutest and most popular breeds tend to be those with the most significant risk of health and behavioral problems. Cuteness is often coupled with their discomfort. People are drawn to the cuteness of dogs with extremely foreshortened skulls and extremely short legs and awkwardly long bodies, such as the French bulldog and the corgi.
Actually, there are well-established health issues. We should treat the “cute economy” with caution, like resisting the commodification (商品化) of appearance by opting out of social media channels promoting the “cute economy”. We can also choose not to “like” or “share” images of dogs whose cuteness is linked with discomfort. Although we are biologically attracted to dogs that are super cute, we should be mindful in our “impulses”.
1. What is the key to the “cute economy” according to the text?| A．Taking photos of different animals. |
| B．Cute animals’ attractive appearance. |
| C．Pets’ owners’ liking adorable pictures. |
| D．Posting cute animals’ pictures on social media. |
| A．A normal-sized dog is eating bones. |
| B．A white cat is quietly lying next to its owner. |
| C．A monkey is attentively taking care of its baby. |
| D．A parrot dressed in a suit is singing and dancing. |
| A．It will change the animals’ nature. |
| B．It may make the animals not so cute. |
| C．It may cause health problems to the animals. |
| D．It will result in a decline in animal population. |
| A．The Cute Economy and Its Price | B．Share Pictures or Not |
| C．Happiness from Pets | D．Marketing Strategy — Cuteness |
Tomatoes: The Real Magical Fruit
“Fresh tomato plants! Straight out of the ground! 50 cents each!” I shouted in the school hall. In my hands, I carried a shoebox with little tomato plants. Their homes were plastic bottles, without the top half. Most people ignored my product, but some handed me 50 cents and picked out a 2-week-old baby tomato plant.
About a month before this, I started gardening. I pulled up grass in my little garden for several days in a row. Satisfied with my work, I continued to the second step — begging my dad to take me to the supermarket. He agreed!
When my dad turned off the engine and opened the door, I practically skipped inside the supermarket. We headed straight for the garden center. I picked up planters, seeds and dirt. My dad helped and showed me the best dirt and tomato plant types to get. We got to the register, and my dad, knowing what would happen, helped me pay.
As soon as I got home, I began to plant them in my garden. The following days witnessed my visits to the garden and my parents were amazed by my devotion to my new-found love.
Then was the part where I met my problem — I planted too many tomato seeds. I realized this all too late, about 10 days later when they all started sprouting (发芽) up and I counted 45 tomato plants. A few days went by and then I ended up with 85 tomato plants.
I did what all high schoolers would do when they messed up — I asked people around. I even got a notebook to write down their suggestions. Sadly, I got the same answer from most people, “Just let them die.” WHAT?! Let my beautiful plants die? They had so much potential! They could make 20 — 30 tomatoes per plant! We were talking about the possibility of around 2,550 tomatoes!
注意：1. 续写词数应为150左右；
2. 请按如下格式在答题卡的相应位置作答。
So, I decided to solve it in my way.
___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________The result was better than I had thought.
___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________1.海洋的重要性；
2.保护海洋的倡议；
注意：1.写作词数应为100词左右；
2.短文题目和首句已为你写好。
Our Oceans, Our Responsibility
June 8th was officially named by the UN in 2009 as World Oceans Day.
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Yours,
Li Hua
