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[主观题]

When a new vent forms, tube worms congregate around it voluntarily.A．YB．NC．NG

When a new vent forms, tube worms congregate around it voluntarily.

A．Y

B．N

C．NG

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发布时间：2020-08-12

更多“When a new vent forms, tube worms congregate around it voluntarily.A．YB．NC．NG”相关的问题

第1题

Vent life dies quickly when exposed to light.A．YB．NC．NG

Vent life dies quickly when exposed to light.

A．Y

B．N

C．NG

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第2题

听力原文： Millions of years ago, whales lived on land and walked on four legs. Today，whale

s still have small bones that are the remains of their hind legs, but these bones can only be seen on the inside of the whale. No one knows why whales left the land to live in the water.

However, scientists can imagine that when the whales changed their environment, their bodies underwent a change—taking on a more fish-like appearance. This new form. offered less resistance to the water, enabling the whales to swim faster.

Despite their fish-like form, whales are not fish. A whale will drown, just as a man will, if it stays under water too long. When a whale is under water, it closes its nostrils tightly and holds its breath. The air in its lungs becomes very hot and full of water vapor. When the whale rises to the surface and exhales, its hot breath produces a column of water vapor that rises high in the air. A man produces the same effect when he exhales warm air on a cold morning.

Whales are classified as mammals because they bear their young, rather than laying eggs, and because the mother whales give the babies milk. Like other mammals, whales have warm blood. Their blood stays at the same temperature, even when they move from hot to cold water. They keep warm in cold water because they have a thick layer of fat just under their skins. This fat is called blubber, and it is thicker on whales that spend their lives in cold water. Almost all land mammals, except man, have hair on their bodies to keep them warm, but whales, which have very few hairs, are kept warm by their fat.

(33)

A．Indifferent.

B．Admiring.

C．Sympathetic.

D．Tolerant.

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第3题

When Earth began to take solid form, there was no water or ice on its surface because ____

__.

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第4题

According to the discoveries of the astronomers, when did galaxies form？

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第5题

What's your earliest childhood memory？ Can you remember learning to walk？ Or talk？ The fir

st time you【C1】______ thunder or watched a television program？ Adults seldom【C2】______ events much earlier than the year or so before entering school, just as children younger than three or four【C3】 ______ retain any specific, personal experiences. A variety of explanations have been【C4】______ by psychologists for this "childhood amnesia" (儿童失忆症). One argues that the hippocampus, the region of the brain which is responsible for forming memories, does not mature【C5】______ about the age of two. But the most popular theory【C6】______ that, since adults do not think like children, they can not【C7】______ childhood memories. Adults think in words, and their life memories, are like stories or【C8】______ -- one event follows

【C9】______ as in a novel or film. But when they search through their mental【C10】______ for early childhood memories to add to this verbal life story, they don't find any that fits the【C11】______ . It's like trying to find a Chinese word in an English dictionary.

Now psychologist Annette Simms of the New York State University offers a new【C12】______ for childhood amnesia. She argues that there simply【C13】______ any early childhood memories to recall. According to Dr. Simms, children need to learn to use【C14】______ spoken description of their personal experiences in order to turn their own short-term, quickly【C15】______ impressions of them into long-term memories In other【C16】______ , children have to talk about their experiences and hear others talk about【C17】______ -- Mother talking about the afternoon【C18】______ looking for seashells at the beach or Dad asking them about their day at Ocean Park. With out this【C19】______ reinforcement, says Dr. Simms, children cannot form【C20】______ memories of their personal experiences.

【C1】

A．listened

B．felt

C．touched

D．heard

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第6题

Questions下列各are based on the following passage. There is plenty of complaints about how

social media--texting in particular--may be harming childrens social and intellectual development. But a new study suggests that constant instant messaging (IMing)and texting among teens may also provide benefits, particularly for those who are introverted(内向的). British researchers studied instant messages exchanged by 231 teens, aged 14 to 18. All of the participants were "regular" or "extensive" IMers. In the U. S., two thirds of teens use instant messaging services regularly, with a full third messaging at least once every day. The researchers analyzed 150 conversations in the study, and reported the results in the journal Computers in Human Behavior. In 100 of these chats, the study participant began IMing while in a negative emotional state such as sadness, distress or anger. The rest were conversations begun when the participant was feeling good or neutral. After the chat, participants reported about a 20% reduction in their distress--not enough to completely eliminate it, but enough to leave them feeling better than they had before reaching out. "Our findings suggest that IMing between distressed adolescents and their peers may provide emotional relief and consequently contribute to their well-being," the authors write, noting that prior research has shown that people assigned to talk to a stranger either in real life or online improved their mood in both settings, but even more with IM. And people who talk with their real-life friends online also report feeling closer to them than those who just communicate face-to-face, implying a strengthening of their bond. Why would digital communication trump human contact？ The reasons are complex, but may have something to do with the fact that users can control expression of sadness and other emotions via IM without revealing emotional elements like tears that some may perceive as embarrassing or sources of discomfort. Studies also show that the anonymity(匿名) of writing on a device blankets the users in a sense of safety that may prompt people to feel more comfortable in sharing and discussing their deepest and most authentic feelings. Prior research has shown that expressive writing itself can "vent" emotions and provide a sense of relief--and doing so knowing that your words are reaching a sympathetic friend may provide even more comfort and potentially be therapeutic.Researchers also found that introverted participants reported more relief from IM conversations when they were distressed than extraverts (内向的) did. As Susan Cain, author of Quiet: The Power of Introverts in a World that Cant Stop Talking, wrote recently for TIME: Introverts are often brimming over with thoughts and care deeply for their friends, family and colleagues. But even the most socially skilled introverts sometimes long for a free pass from socializing or talking on the phone. This is what the Internet offers : the chance to connect--but in measured doses and from behind a screen. What is the finding of the new study by British researchers？

A.Instant messaging will hinder childrens social and intellectual development.

B.Introverted teens may benefit from constant instant messaging.

C.Two thirds of Amebean teens use instant messaging every day.

D.American teens aged 14 to 18 are extensive instant messaging users.

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第7题

When we teach grammar, we mean we focus on _____in teaching.

A、form

B、word meaning

C、sentence meaning

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第8题

PassageTwo Questions 5i to 55 are based on the following passage. Our world now moves so

fast that we seldom stop to see just how fast we seldom stop to see just how far wu have come in just a few year.The latest iPone 6s,for example,has a dual-core proccssor and fite nicely into your pocket. by comparison, you would expect to find a technological specification like this on your tandard laptop in an office anywhere in the world. its no wonder shat new applications for the internet of things are moving ahcad fast when almost every new decice we buy has a plup on the eng of it or a wireless connection to the internet. Soon, our current smartphone lifestyle wilate our own smart home lifestyle too. All researches agree that close to 25 billion devices,things and sensors will be connected by 2020 which incidentally is also the moment that millennials(千禧一代) are expected to make up of our overall workforce, and the fully connected home . become a reality for large umbers of people worldwide. However this is just the tip of the proverbial iceberg as smart buildings and even cities increasingly become the norm as leaders and business owners begin to wake up to the massive savings that technology can deliver through connected sensors and new forms of automation coupled with ligent energy and facilities managemen. Online security cameras, intelligent lighting and a wealth of sensors that control both temperature and air quality are offering an unprecedented level of control, efficiency, and improvements to hat were once classed necessary costs when running a business or managing a large building. We can expect that the ever-growing list of devices, systems and environments remain connected,always online and talking to each other. the big benefit will not only be in the housing of this enormous and rapidly growing amount of data, but will also be in the ability to run real time data analytics to extract actionable and ongoing knowledge. The biggest and most exciting challenge of this technology is how to creatively leverage this ever-growing amount of data to deliver cost savings, improvements and tangible benefits to both businesses and citizens of these smart cities The good news is that most of this technology is already invented. let's face it, it wasn't too long ago that the idea of working from anywhere and at anytime was some form of a distant utopim(乌托邦式的) dream, and yet now we can perform almost any office-based task from any location in the world as long as we have access to the internet. it's time to wake up to the fact that making smart buildings, cities and homes will dramatically improve our quality of life in the years ahead. What does the example of iphone 6s serve to show？A.the huge capacity of the smartphones people now use

B.the widespread use of smartphones all over the world

C.the huge impact of new technology on people's everyday life.

D.the rapid technological progress in a very short period of time

what can we expect to see by the year 2020？A.apps for the internet of things

B.the emergence of millennials

C.the popularization of smart homes.

D.total globalization of the world

what is the most exciting challenge when we possess more and more data？A.how to turn it to profitable use

B.how to link the actionable systems

C.how to do real time data analysis

D.how to devise new ways to store it.

what does the author think about working from anywhere and at anytime？A.it is feasible with a connection to the internet

B.it will thrive in smart buildings, cities and homes

C.it is still a distant utopian dream for ordinary workers

D.it will deliver tangible benefits to both boss and worker

what will business owners do when they become aware of the benefits of the internet of things？A.employ fewer workers in their operations

B.gain automatic control of their businesse

C.invest in more smart buildings and cities

D.embrace whatever new technology there is

请帮忙给出每个问题的正确答案和分析，谢谢！

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第9题

Creatures of the Thermal （热量的) VentsThe three-person submersible Alvin sank through the

Creatures of the Thermal (热量的) Vents

The three-person submersible Alvin sank through the cold, dark waters of the Pacific Ocean for more than an hour, finally touching down on the sea floor more than 8,000 feet below the surface. It was December 1993, and the scientists inside the sub had come to thisstretch of the East Pacific Rise, an underwater mountain range about 500 miles southwest of Acapulco, Mexico, to inspect a recently formed hydrothermal vent--a fissure(裂缝) in the ocean bottom that leaks boiling, acidic water.

Peering out through the sub's tiny windows, the visitors were astonished to see thickets of giant tube worms, some four feet tall. The tail ends of the worms were firmly planted on the ocean floor, while red plumes on the other ends swayed like a field of poppies. Alvin had brought researches to the same spot less than two years earlier, when they had seen none of these strange creatures. Previous measurements showed that individual tube worms could increase in length at a rate of 33 inches per year, making them the fastest-growing marine invertebrates. That means tube worms can grow more rapidly than scientists once thought.

The giant tube worm is one of the most eye-catching members of a diverse community that forms around hydrothermal vents. Scientists once thought that no living thing could survive the harsh combination of toxic chemicals, high temperatures, high pressures, and total darkness at these vents. But in 1977, researchers diving in Alvin discovered tube worms and other strange organisms thriving at a Vent off the Galapagos Islands. Similar communities have since been found at several hundred hot sots around the world. These creatures are like nothing else on Earth.

Vents form. where the planet's crustal plates are slowly spreading apart and magma is welling up from below to form. mountain ranges known as mid-ocean ridges. As cracks form. at these spreading centers, seawater seeps a mile or two down into the hot rock. Enriched with minerals leached from the rock, the water heats and rises to the ocean floor to form. a vent. Vents are usually clustered in fields, underwater versions of Yellowstone's geyser basins. Individual vent openings typically range from less than a half inch to more than six feet in diameter. Such fields are normally found at a depth of more than a mile. Most have been discovered along the crest of the Mid-Oceanic Ridge, a 46,000-mile-long chain of mountains that wraps around Earth like the seams on a baseball. A few vents have also been found at seamounts, underwater volcanoes that are not located at the intersection of crustal plates.

Hydrothermal vents are underwater oases (避风港), providing habitat for many creatures that are not found anywhere else in the ocean. Water pouring out of vents can reach temperatures up to about 400℃; the high pressure keeps the water from boiling. However, the intense heat is limited to a small area. Within less than an inch of the vent opening, the water temperature drops to 2℃, the ambient temperature of deep seawater. Most of the creatures that assemble around vents live at temperatures just above freezing. Thus, chemicals are the key to vent life, not heat. The most prevalent chemical dissolved in vent water is hydrogen sulfide (硫化氢), which smells like rotten eggs. This chemical is produced when seawater reacts with sulfate (硫酸盐) in the rocks below the ocean floor. Vent bacteria use hydrogen sulfide as their energy source instead of sunlight. The bacteria in turn sustain large organisms in the vent community.

The clams, mussels, tube worms, and other creatures at the vent have a symbiotic relationship (共生关系) with bacteria. The giant tube worms, for example, have no digestive system--no mouth or gut. The worm depends virtually solely on the bacteria for its nutrition and both partners benefit. The brown, spongy tissue filling the inside of a tube

A．Y

B．N

C．NG

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第10题

The author specifically mentions that speech is（）.

A、often used when other means are impossible

B、necessary for normal communication

C、the only highly developed system of communication

D、the most developed form

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