1 . Styrofoam, or polystyrene, is a light-weight material, about 95 percent air, with very good insulation (隔热) properties, according to Earthsource. org. It is used in products from cups that keep your drinks hot or cold to packaging material that protects items during shipping. With the above good features, Styrofoam still enjoys a bad reputation. It cannot be recycled without releasing dangerous pollution into the air. The U. S. Environmental Protection Agency says it is the fifth-largest creator of harmful waste.
But now the common worms which are usually disgusting can come to the rescue, specifically, meal-worms. Scientists from the U. S. and China have discovered that meal-worms can digest plastic. One meal-worm can digest a pill-sized amount of plastic a day. Study co-author Wei-Min Wu says that in 24 hours, the plastic is turned into carbon dioxide.
Since Styrofoam has no nutrition at all, are the worms hurt by eating plastic? Much to the scientists’ surprise, the study found that worms eating Styrofoam were as healthy as worms eating bran (谷糠) . The researchers will study the worm’s eating habits and digesting system, looking to copy the plastic breakdown but on a larger scale. Once the way can be put into practice, it will make a revolutionary difference to the disposal of plastic.
“Solving the issue of plastic pollution is important”, says Wu, a Stanford University environmental engineering instructor. After all, our earth is small and landfill space-is becoming limited with too much garbage waiting to be dealt with, he says.
About 33-million tons of plastic are thrown away in the United States every year. Plastic plates, cups and containers take up 25 percent to 30 percent of space in America’s landfills. One Styrofoam cup takes more than 1 million years to recycle in a landfill, according to Cleveland State University.
1. What do we know about Styrofoam?| A．It can be used to cool drinks. | B．It is a weightless material. |
| C．It is harmful when recycled. | D．It is usually used on ships. |
| A．Meal-worms have amazing digesting power. | B．Meal-worms are not bad in their nature. |
| C．Meal-worms can rescue people’s lives. | D．People misunderstood meal-worms in the past. |
| A．by raising amounts of meal-worms | B．by environmental engineering instructors |
| C．using a method inspired by eating meal-worms | D．without sending out dangerous pollution |
| A．Styrofoam is widely used in daily life. | B．Meal-worms are genius at eating plastic |
| C．Plastic recycling may be no more a problem. | D．Plastic can be turned into carbon dioxide |
2 . A blind fish living within a Mexican cave system’s deep, enduring darkness still maintains some ability to sense light. As the cave fish no longer seem to rely on an internal daily cycle and some sleep very little, biologist Inca Stein-dal and her colleagues were keen to see if their bodies can still regulate cyclically through time. Most animals on Earth have an internal clock for this the circadian rhythm (昼夜节律) that uses light levels to make our bodies fit in with our planet’s day and night cycles. This rhythm is then used to cycle through different biological processes that can influence our behaviour, such as our hunger cycles.
The Mexican blind cave fish live in a complex of over 30 isolated caves, within which they have each independently adjusted to the dark. Their bodies are extra sensitive to vibrations (震动), allowing them to sense changes in water currents for navigation (导航) in compensation for their limited or complete lack of sight. This adaptation occurred despite the fish from each cave evolving from the same species with fully functioning eyes. This ancestral group still lives in the surface waters in the El Albra region of Mexico and some parts of the Southwestern US.
Steindal and her team took tissue samples from the blind cave fish, from three isolated caves, and their surface relatives and tested the cells in different conditions. They detected the activation of several molecular (分子的) clock mechanisms when the cells were exposed to light, even in the cave fish cells. “Non-visual light detection is maintained at a fundamental cell-based level,” the researchers explain,although the cave fish cells did not respond as strongly as those cells from surface fish. While there were some similarities between the fish from the different caves compared to their surface relatives, there were also differences that confirm their biological clock changes each evolved independently of one another via different molecular mechanisms.
“We have provided proof that despite being blind, cells from the Mexican blind cave fish can detect light and make their clocks fit in with a light/dark cycle,” Steindal and her colleagues conclude. The team hopes these can help us learn more about the circadian rhythm and provide an easier way to study animal adaptations to dark environments.
1. As to the cave fish, what did Steindal and her fellows try to find out?| A．If they have a circadian rhythm. | B．If they rely on an internal daily cycle. |
| C．If they need to sleep. | D．If they are able to sense light. |
| A．The Mexican cave fish’s ancestors had normal vision. |
| B．The Mexican cave fish’s home is in the dark deep sea. |
| C．The Mexican cave fish have adapted to darkness. |
| D．The Mexican cave fish have trouble navigating. |
| A．Cave fish’s unique molecular structures. |
| B．Non-visual light detection in cave fish cells. |
| C．The cave fish’s adjustment t0 molecular clock mechanisms. |
| D．Biological clock changes evolved independently. |
| A．Why Do the Mexican Cave fish Live in the Darken“ |
| B．A Blind Cave fish Can Still Perceive Light. |
| C．How Can the Mexican Cave fish Fit in with the Day Cycles? |
| D．The Biological Clocks of the Life in the Sen Are Constantly Changing. |
3 . Plastic, which is now common, contains endocrine-disrupting chemicals, or EDCs (内分泌干扰物), that has been linked to increased risk of many chronic diseases. Parental exposure to EDCs, for example, has been shown to cause metabolic (新陈代谢的) disorders, including obesity and diabetes, in the later generations.
Led by Changcheng Zhou, a professor of biomedical sciences in the School of Medicine at the University of California, the researchers investigated the impact of fathers’ exposure to a phthalate called dicyclohexyl phthalate, or DCHP (邻苯二甲酸二环己酯), on the metabolic health of first generation (F1) and second generation (F2) in mice. Phthalates are chemicals used to make plastic more durable.
The researchers found that fathers’ DCHP exposure for four weeks led to high insulin (胰岛素) resistance and impaired insulin signaling in F1. The same effect, but weaker, was seen in F2 .
“We found fathers’ exposure to EDCs may have intergenerational and transgenerational detrimental effects on the metabolic health of their later generations, ”Zhou said. “To the best of our knowledge, our study is the first to demonstrate this.”
In the case of fathers’ exposure in the study, intergenerational effects are changes that occur due to direct exposure to a stressor, such as exposure to DCHP of fathers (F0 generation) and his F1 generation. Transgenerational effects are changes passed down to later generations that are not directly exposed to the stressor (for example, F2 generation).
“This suggests that fathers’ DCHP exposure can lead to sex-specific transgenerational effects on the metabolic health of their later generations,” Zhou said.
Zhou stressed that the impact of exposure to DCHP on human health is not well understood, even though DCHP is widely used in a variety of plastic products and has been detected in food, water, and indoor particulate matter.
“It’s best to minimize our use of plastic products,” Zhou said. “This can also help reduce plastic pollution, one of our most pressing environmental issues.”
1. Why are phthalates added to plastic?| A．To beautify it. | B．To make it long-lasting. |
| C．To reduce its cost. | D．To increase its weight. |
| A．Negative. | B．External. | C．Distinct. | D．Adventurous. |
| A．Bury plastic waste. | B．Watch out for the food they eat. |
| C．Use fewest plastic products. | D．Never produce plastic products. |
| A．Plastic contains endocrine disrupting chemicals |
| B．Plastic pollution is a pressing environmental issue |
| C．DCHP is widely used in a variety of plastic products |
| D．Chemicals in plastic may impact two generations’ health |
It was Christmas Eve morning, and I a woke with a mission: to find my lost cat, Baby-Girl. The icy rain was beating against the windows. I said a prayer for Baby-Girl. It had been six months since she’d gone missing, but I still had faith. It was the season for miracles, after all!
That summer, my sweet cat disappeared from my parents’ house. She had been staying with them while I was between apartments. I lived and worked in Washington DC then. Baby-Girl had got out of my parents’ house three days before I was flew back home to pick her up. Dad and I spent that entire visit searching for her. Dad was the family’s “realist”, meaning he was always trying to prepare me for the worst. “She’s either been hit by a car or been taken in by someone who found her,” he said. Dad always supported me, but he was so uncertain.
Baby-Girl had been a stray cat when I found her. Though I couldn’t explain it, I knew I’d see her again, even after I returned to Washington DC without her and the weeks stretched into months, deep down I had this feeling that we’d be reunited.
Now, home again for the holidays, I was determined to pick up my search. I grabbed Baby-Girl’s cat carrier and loaded it into the car, then asked my dad to drive me to the shelter, hoping I’d find her there. “Sharon, you have to be realistic,” Dad said as we headed to the garage. “She’s been gone too long. You’re not going to find her.” “Well, I just have a feeling,” I said. Dad raised an eyebrow as he climbed into the driver’s seat. “Don’t you believe in Christmas miracles?” I asked. “Bah humbug,” he said. It was his favorite Christmas saying and an inside joke in our family. He even had a shirt with decorations across the front, which he wore every Christmas morning.
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。
At the shelter, the woman at the front desk greeted my dad warmly. “Hi, Mr. Dillon! Still looking for your cat?”
______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Back home, the rest of the family welcomed Baby-Girl. Dad remained stubbornly uncertain.
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My story started one autumn morning, at the bend on a path.
I was 13 years old, and was on the way to school. It was the first time I had caught sight of a fox. Fascinated to the point that I forgot all fear, I dared to go up to it. I had never come so close to a wild animal. There was nobody else around, only me and the fox.
“Hey, fox!” I tried to greet it, though my voice was so weak that it felt like I was saying hello to myself. It didn’t hear me. It stayed there and I watched it. My heart was beating flat out. It was so cute. For a moment, I thought I might be able to touch it.
Throughout the day at school, I could only think of the fox at the big beech (山毛榉) tree. At my return to the place where we met, I was sure I’d find it there.
And I did. This time I gathered a little bit more courage and called out to it, “Fox!” Of course it escaped. But that only made me long to meet it again. I decided that if I could find its kennel (洞) and catch it, I would try and tame (驯服) it, making it my friend.
Thus, I spent most of my free time in the forests trying to find the fox during the following months. But I never saw it again before winter came. During the winter, I followed its footprints far across the fields. Suddenly I was alarmed by the howling of wolves near me. I ran away frightened, stumbled and hurt my ankle. It healed very slowly, so that I had to stay at home during the winter, reading a book about animals of the forest and foxes.
When spring arrived, I was free again. I looked for fox kennels and waited for my fox. To my amazement, it had got young ones but kept moving because of my observations; therefore I decided to observe the fox from a longer distance.
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。
Paragraph 1:
Finally, it would let me get close.
_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Paragraph 2:
To my surprise, the day after I took it home, it fled.
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________6 . Some of the oldest living things on our remarkable planet are trees. The record holders are bristlecone pines (狐尾松) of the western United States, quite a few of which are known to be more than 3,000 years old. One individual, discovered in 2012, is estimated to be more than 5,060 years old, making it the oldest known non-clonal tree in the world!
So, how do trees survive for thousands of years?
The other part of the answer has to do with how trees age. In fact, there is quite a debate about whether ancient trees can be considered “immortal (永生的)”. That is, will such trees ever die if they are not killed by an outside force? We may never know the answer to that, but, at the very least,
Older trees benefit greatly from having bodies made mostly of dead woody tissue. In fact, an old tree might be as much as 95 percent dead tissue! Given that it isn’t alive, wood does not require metabolic (新陈代谢的) activity to maintain it,
| A．so an old tree doesn’t really need to do much to keep living |
| B．This is a question that has something to do with the good luck of trees |
| C．However, bristlecones are certainly not alone in terms of the oldest creatures |
| D．This is a fascinating question for biologists that does not yet have a settled answer |
| E．What’s more, some ancient trees have superior chemical defenses against pests and diseases |
| F．which means that trees can survive everywhere without being limited by external and internal conditions |
| G．we know that ancient trees age in ways that are dramatically different from the ways that most animals and even other plants age |
7 . Nuclear pollution is a serious global
When nuclear accidents occur in coastal areas, the
Following the Fukushima nuclear disaster in 2011, efforts to cool the reactors by pumping in seawater resulted in the
This
| A．change | B．opportunity | C．concern | D．possibility |
| A．caused | B．posed | C．created | D．increased |
| A．resulted in | B．led to | C．brought about | D．caused |
| A．terrestrial | B．aquatic | C．marine | D．atmospheric |
| A．balancing | B．regulating | C．considering | D．stabilizing |
| A．heightened | B．raised | C．decreased | D．lifted |
| A．minor | B．slight | C．substantial | D．insignificant |
| A．accumulation | B．storage | C．deposition | D．buildup |
| A．Therefore | B．Despite | C．However | D．Hence |
| A．from | B．by | C．of | D．in |
| A．residents | B．citizens | C．inhabitants | D．dwellers |
| A．issue | B．measure | C．release | D．disposal |
| A．web | B．chain | C．network | D．system |
| A．urgent | B．immediate | C．pressing | D．critical |
| A．address | B．tackle | C．solve | D．resolve |
“Bang. . !” Sara pushed the door open. She threw her school bag onto the floor and called out, “I’m home!” No answer. The house was silent. It sounded empty, but she knew it wasn’t. Her mum and dad were working upstairs.
Sara got a glass of orange juice, went into the conservatory (玻璃房) and sat down in her favourite chair. The garden was still in the dark afternoon. On one side, her mum’s garden was neat and tidy with boring short grass, boring straight flowerbeds and boring straight paths. But on the other side, Sara’s Nature Garden looked wild and exciting with big dead sunflowers and tall grasses.
“Nobody is interested in me. Mum and dad only think about their work,” she thought sadly.
Then she recalled: One month earlier, she learned in a magazine that many dogs were abandoned because their owners got bored with them; One hour earlier, she saw a cute dog wagging its tail and licking her friend’s face.
Sara knew today was special. Today things were changing. She couldn’t wait any longer. It’s time to talk to her parents.
So Sara got up from her chair and climbed all the way to the loft (阁楼). “Mum, I want a talk.” said Sara. “Just a minute!” Her mum clicked on the keyboard, took off her glasses and turned to her daughter. Sara coughed, took a deep breath, and told her mum that she wanted a dog. “No, Sara. That’s impossible,” her mum said firmly. Sara went to her father but got the same answer. She rushed into her room angrily and slammed the door shut.
Later, Sara’s mum knocked at the door and went in. “Darling, we know this is important to you. You can have a dog if you take the responsibility. But look at your Nature Garden, your school bag, your bedroom! What a mess! Do you think you can take good care of a dog?” said her mum.
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。
Sara was lost in thought and decided to make some changes.
_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________With the dog’s company, Sara began her busy but joyful life.
_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________9 . In recent years, lots of American companies have gotten behind a potential climate solution called carbon capture and storage, and the government has backed it with billions of dollars in tax preferences and direct investments. The idea is to trap planet-heating carbon dioxide from the smokestacks of factories and power plants and ship it to sites via thousands of miles of new pipelines. Communities nationwide are pushing back against these pipeline construction and underground sites, arguing they don’t want the pollution running through their land.
Now the U. S. Forest Service is proposing to change a rule to allow storing this carbon dioxide pollution under the country’s national forests and grasslands. “Authorizing carbon capture and storage on National Forest System (NFS) lands would support the Administration’s goal to reduce greenhouse gas emissions by 50 percent below the 2005 levels by 2030,” the proposed rule change says.
Some experts, like June Sekera, a research fellow with Boston University, question the timing of the proposed rule change, given community pushback across the country to pipelines planned on private land. Yet she says the Forest Service proposal to open up national parks for CO2 storage is “an end run around local towns and counties. And it’s a much simpler and way less expensive route.”
In an email, Scott Owen, press officer for the Forest Service, writes that the proposed rule change would allow the Forest Service to consider proposals for carbon capture and storage projects. He writes that any proposals must still pass through a secondary screening, adding, “The Forest Service has been ‘screening’ proposals for use of NFS lands for over 20 years as a means to be increasingly consistent in our processes and also be able to reject those uses that are inconsistent with the management of the public’s land. ” He notes the Forest Service currently does not have any carbon capture project proposals under consideration. The Forest Service has opened public comments on the proposed rule change until Jan. 2, 2024.
1. What does the Forest Service intend to do by changing a rule?| A．Answer the appeals of communities. | B．Provide legal space for carbon storage. |
| C．Enlarge national pipeline storage capacity. | D．Loosen tax burden on American companies. |
| A．An eventful act. | B．A desperate try. |
| C．An alternative way. | D．A breathtaking race. |
| A．It is still up in the air. | B．It is dead in the water. |
| C．It is widely recognized. | D．It is far from satisfactory. |
| A．A fruitful research. | B．A timely rule change. |
| C．An authorized project. | D．A controversial proposal. |
10 . Cancer-fighting genes in elephants could help tackle one of the biggest killers of people, according to research. Despite their large bodies and long lifespans, elephants are much less likely to die from cancer than humans, with death rates of less than 5 percent.
The paradox has puzzled scientists because more cells lead to greater replications (复制), which increases the possibility of the body failing to detect damaged DNA or a faulty cell that can result in tumors(肿瘤). Elephants live for almost as long as humans and weigh up to five tons.
However, a group of British and European scientists say they have taken a big step towards solving Peto’s paradox, named after the British epidemiologist Sir Richard Peto. Elephants, they say, carry a much larger more diverse group of tumor-fighting proteins.
The findings, published last week in the journal Molecular Biology and Evolution, raise hopes that the cancer fighting genes in elephants could be the key to tackling cancer, which kills about 167, 000 Britons yearly. Cells keep dividing throughout an organism’s life, each carrying the risk of producing a tumor. One of the body’s weapons is a gene called p53 known as the “guardian of the genome”, which hunts cells with faulty DNA. It encourages the cell to repair itself or self-destruct, keeping the cell from combining with others and producing tumors.
Humans have two versions of p53 but elephants have 40, said the researchers. Biochemical analysis and computer simulations also showed that an elephant’s p53 genes are structurally slightly different, providing a much larger anti-cancer toolkit. The researchers suspect that while faulty cells might be able to skirt two p53 versions, they cannot combine with other cells as easily in the face of dozens.
The findings will open the way for research on how p53 genes of elephants are activated and on medical treatment for humans.
1. What has puzzled scientists?| A．Few elephants end up dying from cancer. | B．Elephants live long and weigh enormously. |
| C．More cells lead to higher chances of tumors. | D．A larger body is less likely to discover faulty cells. |
| A．How many Britons die each year. | B．How the anti-cancer gene works. |
| C．How the research was carried out. | D．What the findings have been applied to. |
| A．Strengthen. | B．Detect. | C．Escaped. | D．Cure. |
| A．Scientists find elephants live longer than humans. | B．P53 genes play essential role in preventing cancer. |
| C．Elephant genes could be key to fighting cancer. | D．Groundbreaking treatment for cancer is on the way. |
