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题型:阅读理解-阅读单选 难度:0.4 引用次数:144 题号:8610524

Every spring flowers suddenly come out everywhere on the same day, as if they had an agreement with one another. But how exactly do plants “know” when to flower?

It’s a question puzzling biologists for years. But according to Science Daily, a US research group may have finally answered it—the secret lies in a protein called FKF1. This allows plants to sense the differences in day lengths so that they can tell the seasons are changing.

Researchers found the protein when they were studying a plant called Arabidopsis. They found it’s a photoreceptor (感光器). This means it’ s sensitive to, and can be activated (激活) by sunlight.

Plants produce the protein every day in the late afternoon throughout the year. If there’s no light at this time, for example, in winter when the sun goes down early, it may not be activated. But when spring comes and the days get longer, it can be activated by daylight and the plants “know” it’s time to flower.

Although researchers have only studied how the FKFI protein works in the Arabidopsis, they believe that the process is similar in many other more complex (复杂) plants, including crops like rice and wheat. This could be useful to the agricultural industry.

“If we can control the timing of flowering, we might be able to produce more crops by putting it forward or putting it off,” a leader of the study said. “Also, if we could control the timing of flowering in horticultural (园艺的) plants, they may be worth more money.”

What an amazing thing to think about this!

1. How do plants know when to flower?
A.They get messages from some insects.
B.They receive messages from other plants.
C.A certain protein tells them the time to flower.
D.Sunlight produces a protein in them to help them flower.
2. What can we learn from the article?
A.The study may benefit agricultural industry.
B.We may have plants that flower all year round.
C.Plants don’t flower in cold weather and short days.
D.Researchers found the protein by studying rice and wheat.
3. What’s the writer’s attitude towards the study?
A.Negative.B.Positive.
C.Uncaring.D.Unclear.

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阅读理解-阅读单选(约390词) | 较难 (0.4)
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文章大意:本文是议论文。文章主要讲述我们为什么不知道雌鸟也鸣叫?科学界也存在偏见,需要多样化的参与。

【推荐1】Female birds sing, too, but scientists tend to tune in to male birdsong and ignore female songs. It highlights a long-standing bias (偏见) and helps us think about why that bias persists (持续).

Since the beginning of modern birdsong research, the field has focused on male songbirds. Any serious birder could tell you that females do sing, sometimes as frequently as males. However, early birdsong researchers tended to be men. Men are significantly less likely than women to lead research projects studying female songs. Thus, we are missing key behaviors as a result of historical biases caused by a lack of diverse participation in science.

So how do we make science welcoming and accessible for all? We need to communicate better with nonscientists. Engaging the public in science is essential for basic science findings that influence how we perceive the world around us.

For example, understanding that female birds do sing matters not only to scientists but also to the billions of people who hear the sounds of wild birds every day. In many species, males and females look similar from a distance, but can be distinguished by ear. Paying close attention to which sounds each sex makes and thinking about why they might be producing them opens up a richer window into the environment around us. It turns out female birds use songs for all the same reasons male birds do: to signal individual identity, defend valuable territories and attract potential mates.

Public awareness of female birdsong has the potential to change the science itself. Apps like eBird collect millions of public observations and audio recordings of birds every year. Increasing public engagement and involvement with research promises to benefit the scientific community and society more broadly. In many cases, scientists and experts already have strongly held biases about the way the world works, and these biases allow mistaken conclusions to persist. Public observers often make better observers of the world around them because they lack preconceived ideas.

Female birds sing! We welcome a future where research and communication combine to improve our understanding of the world around us and deepen our connections to each other and the natural world.

1. What does the second paragraph mainly talk about?
A.Who is to blame for the long-standing bias.
B.Why female birdsong is long ignored by scientists.
C.What contributes to diverse participation in science.
D.How men have conducted modern birdsong research.
2. Why is it important for us to be aware of female birdsong?
A.It will enable us to become real scientists.
B.It will help us distinguish bird species by ear.
C.It will expand our understanding of the world.
D.It will make advanced science accessible for all.
3. What does the underlined word "preconceived" mean in Paragraph 5?
A.Biased.B.Creative.
C.Mistaken.D.Varied.
4. Which of the following is a suitable title for the text?
A.Why we Didn't Know That Female Birds Sing?
B.Advancing Science: How Bias Leads Us Forward
C.New Research Has Found Female Birds Sing Too!
D.A Case Study of Gender Bias in Science Reporting
2022-03-24更新 | 222次组卷
阅读理解-阅读单选(约340词) | 较难 (0.4)

【推荐2】Colorado officials will stick to a plan to kill some mountain lions and bears to support the state’s dropping mule deer (长耳鹿) population.

Wednesday’s vote permits organizations to kill up to 25 black bears and 15 mountain lions per year in the central and western parts of the state. The project will run for three years, to be followed by a six-year study of how deer populations respond to fewer predators(捕食者).

The population of Colorado’s mule deer has suffered a puzzling, years-long drop to about 450,000, which state officials said was about 110,000 fewer than there should be. A 2014 state study tied it to seven causes, including predators, whose number has greatly increased in recent years.

Some experts, however, said the state should focus first on the human-led destruction(破坏) of mule deer habitat(栖息地). “The drop of the mule deer population is obviously not a simple problem with simple causes,” Brian Kurzel, director of the National Wildlife Federation, said. “By far, the greatest problem—the one that I think deserves the most attention in any science-based study—is habitat quantity and quality.”

Kurzel pointed out that the U.S Bureau of Land Management recently agreed to create 15,000 new oil and gas wells somewhere in western Cororado, which was often called “the mule-deer factory”. There, the number of mule deer has fallen to about 30,000 from more than 100,000 in the early 1980s. Though state officials have known oil and gas development affects the population of mule deer, they didn’t go against the plan.

Other causes like building highways, population growth and human activities are also curbing the mule deer population, according to the study.

State Parks and Wildlife officials don’t necessarily disagree. They started a $4.5 million program as a way to gather research for later decisions.

1. Why do Colorado officials want to have so many mountain lions and bears killed?
A.To stop them hurting people.
B.To leave more habitat for mule deer.
C.To stop the mule deer population from dropping.
D.To help researchers carry out a three-year-long study.
2. What is the most important in protecting mule deer according to Brian Kurzel?
A.Protecting their habitat.B.Providing enough food for them.
C.Reducing the number of their predators.D.Asking the government to make an effort.
3. Which of the following can replace the underlined word “curbing” in the last but one paragraph?
A.limiting.B.ensuring.C.increasing.D.protecting.
4. What do State Parks and Wildlife official mean in the last paragraph?
A.Decisions will be made in one year.
B.Habitat loss is the main cause of the drop.
C.Human activities aren’t responsible for the drop.
D.It’s too early to say what exactly caused the drop.
2018-05-18更新 | 133次组卷
阅读理解-阅读单选(约380词) | 较难 (0.4)

【推荐3】We've known for years that plants can see,hear,smell and communicate with chemicals.Now, reported New Scientist,they have been recorded making sounds when stressed.

In a yet-to-be-published study, Itzhak Khait and his team at Tel Aviv University, in Israel, found that tomato and tobacco plants can make ultrasonic(超声的)noises. The plants "cry out" due to lack of water,or when they are cut. It's just too high-pitched(音调高的)for humans to hear.

Microphones placed 10 centimeters away from the plants picked up sounds in the ultrasonic range of 20 to 100 kilohertz(干赫兹)。Human hearing usually ranges from 20 hertz to 20 kilohertz."These findings can change the way we think about the plant kingdom,”they wrote.

On average,"thirsty"tomato plants made 35 sounds an hour,while tobacco plants made 11. When they were cut,tomato plants made an average of 25 sounds in the following hour,and tobacco plants 15.Unstressed plants produced less than one sound per hour,on average.

Perhaps most interestingly,different types of stress led to different sounds.The researchers trained a machine-learning model to separate the plants' sounds from those of the wind,rain and other noises of the greenhouse.In most cases,it correctly recognized whether the stress was caused by dryness or a cut.Water-hungry tobacco appears to make louder sounds than cut tobacco,for example.Although Khait and his colleagues only looked at tomato and tobacco plants,they think other plants also make sounds when stressed.

If farmers could hear these sounds,said the team,they could give water to the plants that need   it most.As climate change causes more droughts,they said this would be important information for farmers. "The sounds that drought-stressed plants make could be used in precision(精准) agriculture, "said Anne Visscher at the Royal Botanic Gardens,Kew,in the UK.

Khait's report also suggests that insects can hear the sounds up to 5 meters away and respond. For example,a moth(蛾子)may decide not to lay eggs on a water-stressed plant.Edward Farmer. at the University of Lausanne,Switzerland,is doubtful.He said that the idea of moths listening to plants is"a little too speculative”。

If plants are screaming(尖叫)for fear of their survival,maybe we should be glad we can't hear them.

1. Paragraph 3 mainly explains_______.
A.where humans differ from plants
B.how the research was carried out
C.what the findings of the study are
D.why humans can't hear the cries of plants
2. Which of the following is TRUE according to the study?
A.All plants make sounds when they feel hungry.
B.Stressed plants make more sounds than unstressed ones.
C.Tobacco plants are more afraid of thirsty than being cut.
D.The more stressed a plant is,the louder sounds it makes.
3. What does the underlined word"speculative"in Paragraph 7 probably mean?
A.Surprising.
B.Uncertain.
C.Incorrect.
D.Unique.
4. What is the best title for the text?
A.Deaf humans
B.Stressed plants
C.Silent screams
D.Precision agriculture
2020-06-09更新 | 84次组卷
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