A special committee of scientists___________ to study AI's effects on economy in the years ahead.
A.have established. B.will be established. C.are established. D.is establishing
高三英语单项填空中等难度题
A special committee of scientists___________ to study AI's effects on economy in the years ahead.
A.have established. B.will be established. C.are established. D.is establishing
高三英语单项填空中等难度题查看答案及解析
Scientists are trying to develop a special material, ________ they will make use of in
spacecraft.
A. it B. one C. that D. what
高三英语单项填空中等难度题查看答案及解析
Scientists are trying to develop a special material, _______ they will make use of in space.
A. that B. what C. it D. one
高三英语简单题查看答案及解析
1. Scientists are trying to develop a special material, _______ they will make use of in space.
A. it B. that C. what D. one
高三英语单项填空简单题查看答案及解析
Scientists are trying to develop a special material, _______ they will make use of in space.
A. it B. that C. what D. one
高三英语单项填空中等难度题查看答案及解析
Scientists studying the impact of climate change on the Arctic need to consider ways to reduce their own carbon footprints(碳排放量), says Ryan Brook, a researcher who regularly flies north to study the health of caribous(驯鹿).He calls on scientists to show leadership by examining and sharing ways to reduce the impact of working in polar regions.
“The importance of the research is not at question here. It is important to our understanding of and adapting to climate change. But we need to think about better approaches,” says Brook.
“This is an issue for all scientists, though polar researchers often travel particularly long distances using commercial air travel. We also rely extensively on small aircraft, icebreakers, and snowmobiles, all of which produce large amounts of carbon.”
Brook studies the health of caribou herds in Nunavut and Northwest Territories. He works with northern wildlife managers. This work typically takes him north five or six times per year and when he calculated his own carbon footprint, he was not happy with the result.
“My research footprints are about the same as the annual footprints of an average Toronto resident. Basically, I have two footprints — my own personal life, which is moderate, and my research footprint.”
Climate scientists can rightly argue that Arctic research is a specialized field and the community of scientists who travel north is relatively small. Even if all scientists working in the north reduced their carbon emissions, it would not make a big impact on the global scale. For Brook, it’s the option that matters.
There are ways researchers can reduce the amount of carbon they use. Some helicopters use less fuel than others. Solar and wind power are alternatives to gas-fired generators. And while carbon offsets(抵消) don’t reduce the amount of carbon emitted, they are an easy first step.
“There aren’t necessarily any easy answers, but we need to start talking about it,” says Brook. “This is particularly important for the next generation of scientists being trained and I hope to see them become leaders in this issue.”
1.What did Brook find when he calculated his own carbon footprints?
A.His carbon footprints are more than the annual footprints of a Toronto resident. |
B.His personal life footprints are more than the annual footprints of a Toronto resident. |
C.His research footprints are about the same as his personal life footprints. |
D.His personal life footprints are more than his research footprints. |
2. Brook’s opinion is challenged by the statement that ________.
A.arctic research is very important |
B.the Arctic is a special environment |
C.the footprints of Arctic scientists are small |
D.Brook’s situation is a common phenomenon |
3.We can infer from the last paragraph that ________.
A.we should take actions immediately instead of just talking |
B.it’s easy to start talking about the problem of carbon emissions |
C.it’s necessary now to pay attention to the problem of research footprints |
D.the next generation of scientists are more interested in research footprints |
4.What’s the main idea of the text?
A.The importance of arctic research is not at question. |
B.Climate change becomes worse because of arctic research. |
C.Brook suggests ways of reducing the use of carbon. |
D.Scientists must look at their own carbon footprints. |
高三英语阅读理解中等难度题查看答案及解析
According to a study published in the pre-print website bioRxiv, a team of Israeli scientists recorded tomato and tobacco plants producing sound frequencies which humans cannot hear in stressful situations—such as when they experienced a lack of water or their stems were cut. The team identified the sounds with microphones placed around 10 centimeters (around four inches) away from the plants, though the scientists say the noises could potentially be heard several feet away by some mammals and insects, such as mice.
Plants exposed to drought stress have been shown to experience cavitation (空化现象)— a process where air bubbles (气泡)form, expand and explode inside tissue that transports water. These explosions produce sound, but they have only ever been recorded using devices directly connected to the plants. The latest study, meanwhile, is the first to identify plants making sounds which can be detected over a distance. And the researchers say that cavitation could potentially be the source of these sounds.
The team detected the tomato plants made 35 sounds an hour on average when they were exposed to drought conditions, while the tobacco plants produced 11. When the stems of the plants were cut, the tomato plants made 25 sounds an hour on average and the tobacco plants produced 15. As a comparison, unstressed plants made less than one sound hour on aver-age, according to the study.
The team say that while they only tested tomato and tobacco. It's possible that other plants could also produce sounds, adding that the latest findings could have implications for agriculture. ''Plant sound emissions could offer a novel way for monitoring crops' water state—a question of vital importance in agriculture, '' the authors wrote in the study. ''More Precise irrigation can save up to 50 percent of the water consumption and increase the output, with dramatic economic implications. ''
''According to Anne Visscher from the Royal Botanic Gardens, Kew, in the U. K., the idea that the sounds could be used in precision agriculture is 'practical' though she urges caution regarding the Israeli team's suggestion that other animals could hear the sounds at a distance, '' New Scientist reported.
1.What do the Israeli scientists find about plants?
A.Stressed plants tend to lack water.
B.Some plants can understand humans' sounds.
C.Stressed plants can make more frequent sounds.
D.Some mammals and insects can communicate with plants.
2.What can we learn about cavitation?
A.It may contribute to the plants' sounds.
B.It may lead to plants experiencing drought.
C.It is determined by the number of air bubbles.
D.It was identified and recorded for the first time.
3.How many sounds do the tomato plants make per hour on average when cut?
A.11. B.15.
C.25. D.35.
4.What's Anne Visscher's attitude to applying the study to agriculture?
A.Supportive. B.Cautious.
C.Reserved. D.Opposed.
高三英语阅读理解中等难度题查看答案及解析
The committee asked for these suggestions to be ______ on paper, so that they might study them further.
A.brought down B.handed down C.laid down D.put down
高三英语单项填空中等难度题查看答案及解析
The committee asked for these suggestions to be ______ on paper, so that they might study them further.
A. brought down B. handed down C. laid down D. put down
高三英语单项填空中等难度题查看答案及解析
Scientists have discovered a special biological behavior in dolphins(海豚) that could lead to a treatment for late-onset diabetes(晚发的糖尿病) in humans. Studies on dolphins found that healthy dolphins switch into a diabetic-like state overnight when they are not feeding, but return to normal when they eat the following morning.
The extraordinary finding has led scientists to suggest that dolphins have “genetic switch” that allows them to imitate diabetes while they are not feeding for a night, without suffering any ill effect.
If researchers can identify a similar genetic pathway in human, they may be able to develop drugs to effectively switch off diabetes. Some 2.2 million people in Britain have type 2 (or late-onset) diabetes, a figure that is expected to reach 4 million by 2025 as a consequence of rising levels of obesity(肥胖).
The tissues of people with type 2 diabetes have become resistant to insulin(胰岛素) so they lose the ability to control sugar levels in their blood. The condition can damage the heart, eyes, kidneys(肾脏) and nerves and contribute to 5% of all deaths, according to the World Healthy Organization.
Dolphins appear to imitate diabetes to keep high levels of blood sugar when food is rare. Like humans, dolphins need some sugar in their blood for their brains to function normally. Venn-Watson’s team analyzed 1,000 blood samples(样本) from 52 dolphins while they didn’t eat anything overnight and fed in the morning. At night time, the dolphins’ metabolism(新陈代谢)changed greatly and showed similar characteristics to that seen in people with type 2 diabetes.
“It is our hope that this discovery can lead to new ways to prevent, treat and maybe even cure diabetes in humans,” said Stephanie Venn-Watson, director of clinical research at the National Marine Foundation in San Diego.
1.What’s the main idea of the passage?
A. Humans get some idea of treating diabetes from dolphins.
B. Dolphins can switch into a diabetic-like state overnight.
C. Humans can suffer the same disease as dolphins.
D. Dolphins should be fed regularly to avoid diabetes.
2.The key to applying the finding to curing human diabetes lies in ____________.
A. producing insulin in a larger amount
B. developing drugs from healthy dolphins
C. identifying a similar genetic pathway in human
D. analyzing more blood samples from hungry dolphins
3. Which of the following statements is TRUE according to the passage?
A. Scientists have found a similar genetic switch in humans.
B. More British people will suffer type 2 diabetes due to obesity.
C. 2.2 million people with type 2 diabetes die in Britain every year.
D. Dolphins imitate diabetes to avoid a high blood sugar level.
4.What will happen to dolphins if not fed for a night according to Venn-Watson?
A. Their metabolism breaks down.
B. They become resistant to insulin.
C. Their heart and kidneys are damaged.
D. They keep high levels of blood sugar.
高三英语阅读理解中等难度题查看答案及解析