On the plains of northwest Oklahoma, you can see for miles: nothing but grass, masses of evergreen trees and steep red-rock canyons(峡谷). But with my telescope, I could see the helicopters, one after another clearly, dumping water on a wildfire in the far distance. I wasn’t concerned by the small cloud of smoke snaking skyward. It had to be at least 50 miles away, even across the South Canadian River.
That afternoon, my uncle Larry, my cousin Tony and I had driven to this 4, 000-acre farm for a three-day hunt. I took a few pictures of bushy trees and grand canyons. Then I sent some of them with my cellphone to my wife, Ande, who was 60 miles away. “There’s nothing to worry about. Just have a nice day.” I typed. She had seen the fire on the news and called a few minutes earlier to warn me. Anyway, I didn’t want her to be worried.
The wind had picked up, blowing hard from the southwest. We climbed into the vehicle, with Larry driving, to look for places to hunt the turkeys the next day. We headed north along a small road and stopped here and there to look for signs of turkeys.
We drove for about a mile before Larry turned to head back south, toward the farmhouse. As we did, my eyes went wide. A wall of flames was racing toward us, maybe three quarters of a mile away. “Get us out of here!” I screamed. Larry speeded up the vehicle, bouncing hard along the small road. How had the fire jumped over the river? The flames would be on us in no time. With a fence blocking the way, we jumped out of the vehicle. Then I made a phone call to Ande. “We’re surrounded by fire,” I shouted over the howling wind. “Call 911! We need a helicopter to get us out of here.” The connection went dead.
Paragraph 1:
I looked around, but I couldn’t see Larry and Tony.
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Paragraph 2:
When I woke up, I found myself in a helicopter.
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World Soil Day
As we all know, the
World Soil Day 2022 and its campaign, “Soils: Where food begins”, aims
Soil nutrient loss is a major soil degradation (退化) process threatening nutrition.
Our lives depend
3 . As temperatures soar, electric bills often go through the roof. That’s because people tend to turn on their air conditioners during the long, hot summer months.
It’s been predicted that by 2050 about 75 percent of the world’s homes could have air conditioners. If that’s true, the energy required to cool buildings will double. For that reason, researchers continue to look for solutions to keep air-conditioner usage to a minimum. Some innovations are being used already or are in the process of being developed. Certain building materials can feel cooler because of their ability to absorb heat and release it slowly. Other buildings use water cooling systems to cool them. However, these aren’t the only methods. Science has a few more tricks up its sleeve.
Researchers at Purdue University have developed the world’s whitest paint. This paint can keep a building’s exterior surface cooler than the surrounding temperature. On hot days, walls absorb heat and often become 10 to 20 degrees Celsius hotter than the air around them. But walls painted with Purdue’s white paint reflect 98.1 percent of the heat and send it back into space. This creates a cooling effect.
Purdue professor Xiulin Ruan believes that the super-white paint could have a more powerful cooling effect than many home air conditioners. Researchers hope to have the paint on the market in five to 10 years.
Yi Zheng of Northeastern University has created a “cooling paper”. This material reflects the sun’s rays while pulling heat out of a building’s interior, and the paper can be recycled. He and his team discovered that the paper helps bring down a room’s temperature by about 6 degrees Celsius. Zheng hopes that the cooling paper will someday be used on roofs and within building materials.
Now and in the future, perhaps some of these energy-efficient methods will make it easier to beat the heat.
1. Why does the author mention the air conditioners at the beginning of the passage?| A．To describe a fact. | B．To support an idea. |
| C．To provide examples. | D．To introduce the topic. |
| A．It has been on the market. |
| B．It is the world’s coolest paint. |
| C．Walls painted with it reflect most of the heat. |
| D．It can keep the whole building’s surface cooler. |
| A．The surface of a buildings is better covered with paper. |
| B．Buildings will be built mostly with cooling paper someday. |
| C．The cooling paper will be practical and eco-friendly building materials. |
| D．The cooling paper can bring down a room’s temperature more than air conditioners. |
| A．Purdue’s White Paint: A New Material to Cool Buildings |
| B．Cool Buildings: Innovative Ways to Keep Buildings Cool |
| C．Cool Building Materials: Solutions to Fight against Climate Change |
| D．Future Air Conditioners: New Energy-efficient Methods to Beat the Heat |
4 . “A beautiful field of flowers can be a rather noisy place. It’s just that we can’t hear the sounds.” Scientists at Tel Aviv University have conducted a six-year experiment, proving that plants make noise in certain stressful situations.
Plants produce a high frequency (频率) clicking sound, and when short of water, or damaged, the clicks become far more regular. They also made different sounds, depending on whether they were thirsty or injured. “Each plant and each type of stress is related to a specific sound,” said Professor Lilach Hadany, who led the research study.
Focusing particularly on tomatoes, wheat and corn, the plants were placed in a soundproof(隔音的)room and recorded by microphones. Some plants were starved of water, others cut, and a control group was left undamaged. The researchers used an algorithm (算法) to separate the noises, suecessfully telling the difference between the sounds depending on whether they were dry or cut. The algorithm did this in a greenhouse setting which included far more surrounding sounds, but it was still able to recognize the particular cries for help of the plants.
On average, the human ear can hear sounds up to around 20kHz, while the sounds produced by plants are in the 40-80kHz region, far beyond our hearing. “The sounds made by plants can’t be heard by humans but can probably be heard by various animals, such as bats, mice and insects,” Hadany tells us. Though this has yet to be proven, it’s possible that these creatures use this information to choose which plants to eat.
A study led by Reda Hassanien of China Agriculural University in Beijing years ago, also proved that plants reacted to sound waves, with some plants greatly increasing their yield. While evidence shows that plants can react to sounds, there’s no evidence today that they can actually hear them.
1. What can we know from the six-year experiment?| A．Plants of different types make the sound of the same frequeney. |
| B．Plants produce more regular sound in certain stressful situations. |
| C．Plants make sounds with a much lower frequency when stressed. |
| D．Plants make the sound of the same frequeney whatever the situation. |
| A．To record the sounds. | B．To control the sounds. |
| C．To produce the sounds. | D．To identify the sounds. |
| A．Plants can hear each other’s cry for help. |
| B．Animals can hear the sounds made by plants. |
| C．Plants can make sounds and respond to sound waves. |
| D．Animals decide what to eat based on the sounds plants make. |
| A．Sounds That We Can’t Hear |
| B．Beautiful Songs from Plants |
| C．Plants React to Different Types of Stress |
| D．Plants Talk, Especially When Stressed |
5 . Christmas is a time of great joy but it can also lead to over-consumption. Here’s how to cut back on unnecessary purchases (购买) and help save the planet in the process.
Get an eco-friendly tree
Having a Christmas tree at home has been a British tradition since the 1700s and we fill our homes with around 8 million a year. But we know plastic trees pollute the planet and cutting down a two-metre tree can produce up to 16 kg of CO2 when it rots in landfill according to the Carbon Trust. But there is an alternative. You can rent a tree from Eco-Elf who deliver it to your door, and then collects it after Christmas to replant it in their UK forests.
Give gifts that make new memories
There’s so much pressure to buy friends, family, colleagues, or neighbours a gift at this time of year. But in fact around £42 million worth of Christmas presents aren’t wanted and end up in dustbins each year, which is not eco-friendly. Chances are your loved ones would rather spend more time with you than have more gifts. You could either book an experience together like a cooking class or a boat trip; organise a nature treasure hunt or go bird-watching; or share a skill you have with them like fixing their bike.
1. What do we know about eco-friendly Christmas trees?| A．They will produce much CO2. |
| B．They can be bought from Eco-Elf. |
| C．They can be replanted after Christmas. |
| D．They have been used by British since the 1700s. |
| A．Fixing your friend’s bike. |
| B．Organizing a business trip. |
| C．Enjoying bird-watching. |
| D．Sharing a cooking class with your kids. |
| A．To introduce several Christmas traditions. |
| B．To cut back on any purchases at Christmas. |
| C．To help people have an eco-friendly Christmas. |
| D．To remind people to spend more time with family at Christmas. |
