3 . 听下面一段独白，回答以下小题。
1. Who might the listeners be ?

A．Contest judges.

B．Company employees.

C．Technology enthusiasts.

2. How do most people feel about virtual conferences ?

A．They ’ re convenient.

B．They ’ re advanced.

C．They ’ re strange.

3. Why does the speaker mention the EGU General Assembly 2020?

A．To share his experience.

B．To support his argument.

C．To draw the listeners ’ attention.

4. What is the theme of the speaker ’ s speech ?

A．The advantages of virtual conferences.

B．Virtual conferences during the lockdown.

C．Different opinions about virtual conferences.

6 . An international team of researchers led by Stanford University have developed rechargeable batteries that can store up to six times more charge than ones that are currently commercially available.

The advance, detailed in a new paper published on Aug. 25 in the journal Nature,could accelerate the use of rechargeable batteries and puts battery researchers one step closer toward achieving two top stated goals of their field: creating a high-performance rechargeable battery that could enable cellphones to be charged only once a week instead of daily and electric vehicles that can travel six times farther without a recharge.

The new so-called alkali metal-chlorine batteries(碱金属氯电池），developed by a team of researchers led by Stanford chemistry Professor Hongjie Dai and doctoral candidate Guanzhou Zhu, rely on the back-and-forth chemical transition from sodium chloride (Na/C12) or lithium chloride (Li/C12) to chlorine. When electrons travel from one side of a rechargeable battery to the other, recharging makes the chemistry return to its original state to await another use. Non-rechargeable batteries have no such luck. Once running out, their chemistry cannot be restored. “A rechargeable battery is a bit like a rocking chair. It tips in one direction, but then rocks back when you add electricity,” Dai explained. “What we have here is a high-rocking rocking chair.”

The researchers imagine their batteries one day being used in situations where frequent recharging is not practical or desirable, such as in satellites or remote sensors. Many otherwise usable satellites are now floating in orbit, failing to function due to their dead batteries. Future satellites equipped with long-lived rechargeable batteries could be fitted with solar chargers, extending their usefulness many times over.

For now, though, the first working design they've developed might still be suitable for use in small everyday electronics like hearing aids or remote controls. For consumer electronics or electrical vehicles, much more work remains to engineer the battery structure, increase the energy density (密度）， scale up the batteries and increase the number of cycles.

1. Why does the author mention “two top stated goals” in paragraph 2?

A．To clarify the cause of the research.

B．To describe the process of the research.

C．To explain the purpose of the research.

D．To illustrate the significance of the research.

2. How did Professor Dai explain how the new batteries work?

A．By listing figures.

B．By giving an example.

C．By making a comparison.

D．By drawing a conclusion.

3. What can we learn from the passage?

A．New rechargeable batteries have been put to use.

B．New rechargeable batteries will likely be used in remote sensors.

C．Non-rechargeable batteries can return the chemistry to its original state.

D．Solar chargers are of no benefit to rechargeable batteries in future satellites.

4. What is the author's attitude to the new batteries?

A．Objective.

B．Unconcerned.

C．Doubtful.

D．Ambiguous.

7 . When I was a boy, we lived 4 miles outside of town. We lived next to the forest and I would spend hours every day playing in it with the oak (橡树) and maple trees as my companions. I would climb up their limbs, sit in their shade, and feel their peace.

That is why it was so hard for me when I found myself to be a lumberjack as a young man. It wasn't just the back breaking work, the long hours, and the low pay. It was also seeing day after day beautiful trees that had grown for half a century being sawed (锯) up and cut into flooring. Still, I couldn't help but think that they looked a lot more lovely as living trees reaching up to Heaven than as dead flooring lying under my feet.

One afternoon after a long day's work, I was feeling particularly down and depressed.I decided to take a walk in the woods like I had as a boy in hopes of lifting my spirits and calming my soul. As I walked along with my aching back and tired body, I longed for those happy childhood days. I dropped my head frustratedly and looked down at the dirt. That is when I saw it: a single, red oak acorn (橡子) that had somehow survived the hungry deer and squirrels all winter long.Then I remembered something I'd read once: “Eventually an acorn becomes a forest!” I smiled, bent down, dug up a handful of dirt, and planted that little acorn, feeling peace and joy warming my heart. Then I walked back home happy once again to be a part of God's green earth.

In this life we all start out as an acorn, but whether we become a forest or not is up to us. God gives us this glorious life here to grow, learn, laugh, love,share, smile, and help others to do the same.Embrace this gift of life. Use it to every day stretch your soul towards Heaven and create a mighty forest of love.

1. Which of the following can best describe the author's childhood?

A．Carefree

B．Dull.

C．Plain.

D．Miserable.

2. What does the underlined word “lumberjack” mean in the second paragraph?

A．A person who plants trees.

B．A person who waters trees.

C．A person who cuts trees.

D．A person who protects the forest.

3. What did the author do when walking in the woods?

A．He climbed up an oak tree.

B．He planted a little oak acorn.

C．He came across a book he had ever read.

D．He found some hungry deer and squirrels.

4. What is the best title for the text?

A．Accepting the gift of life.

B．Taking a walk in the woods.

C．Experiencing a typical working day.

D．Refreshing the unforgettable memory.

8 . My daughter was having trouble recently deciding on what to major in at college, so she asked for my _________. I told her the one thing I wish that I had been told at her age: “Find a _________ that you love and you will never work a day.” I didn't know how to answer, though, when she asked me what she should do if she had to take a job that she _________.

That question brought back a lot of _________ of jobs that I had over the years. I remembered one in particular. My young family was _________. We had no money, and there were no good _________ to be had in the area. My brother, _________, got me a job at a local lumber mill (木材场). The work was hard and meant constant pain for my back. Hours were spent loading and stacking (码放) wood. The pay was very _________. In the winter the skin on my fingers bled from the cold, dry air. In the several years I worked there, many people left. Only those of us who had families to support didn't leave to _________ something better.

Still, I also remembered singing to myself while working. I remember as I pushed the lumber carts, glancing out the window and __________ watching the leaves changing in the fall. I remembered how a __________ sandwich tasted like the greatest meal in the world after hours of hard work. I remembered being grateful for this job so I could __________ my family. Remembering all this gave me the answer I needed for my daughter. “Just __________ your love to your job then, sweetheart,” I said. “If you can't do what you love, then __________ what you do.”

In this life we work to __________ but we live to love. Without love, work is drudgery (苦差事). Yet, with love, work is joy.

1.

A．permission

B．advice

C．choice

D．expectation

2.

A．hobby

B．person

C．major

D．career

3.

A．hated

B．wanted

C．needed

D．enjoyed

4.

A．thoughts

B．regrets

C．memories

D．opinions

5.

A．improving

B．enlarging

C．moving

D．struggling

6.

A．stores

B．jobs

C．markets

D．universities

7.

A．however

B．instead

C．therefore

D．meanwhile

8.

A．good

B．low

C．promising

D．reasonable

9.

A．ask for

B．wait for

C．look for

D．prepare for

10.

A．boringly

B．anxiously

C．angrily

D．joyously

11.

A．different

B．simple

C．unique

D．healthy

12.

A．see

B．save

C．start

D．feed

13.

A．bring

B．prove

C．continue

D．put

14.

A．change

B．end

C．love

D．respect

15.

A．live

B．get

C．succeed

D．practice

9 . Greying Population Stays in the Pink

Elderly people are growing healthier, happier and more independent, say American scientists.

In the last 14 years, data have been gathered on the health and lifestyles of more than 20,000 people over 65. Researchers say high blood pressure and circulation problems and other diseases of old age are troubling a smaller proportion every year.     1     . It really raises the question of what should be considered normal ageing, because the problems with old people are often not appearing until they are 70 or 75.

    2    . But there may be other contributing factors. Improvements in childhood nutrition gave today’s elderly people a better start in life.

One interesting fact is that better-educated people are likely to live longer. For example, 65-year-old women with fewer than eight years of schooling are expected, on average, to live to 82. Those who continued their education live an extra seven years.     3    .

The survey also assessed how independent people over 65 were, and again found a striking trend. Their self-reliance is probably linked to an increasing use of home medical aids, such as raised toilet seats and bath seats.     4    .Those elderly people who were independent were more likely to stay healthy in old age.

    5    . Researchers found that elderly people who felt emotionally isolated maintained higher levels of stress hormones even when asleep. So they suggest that older people live best when they feel independent but know they can get help when they need it.

A．But independence can have drawbacks.

B．It is not surprising we see some effects.

C．If the trends apparent in the United States continues,

D．These developments also bring some health benefits.

E．Clearly, certain diseases can be prevented or cured because of medical advances.

F．And the rate at which these diseases are declining continues to increase.

G．Researchers say it is because educated people seek more medical attention.

10 . Facial recognition is a new technology built into all sorts of applications. It's also one of the more controversial technologies pioneered today, as it sets up deep questions regarding security versus privacy rights, and how these facial recognition applications can be safely and fairly applied.

Modern facial recognition is clearly dependent on specific technologies and algorithms (算法) that we've built during the machine learning and artificial intelligence era of the early 21st century. Specifically, most cutting-edge facial recognition programs feature a type of neural network called a convolutional (卷积) neural network (CNN). The system uses convolutions as well as other algorithm work in successive stages to do complex analysis of an image, and even identify people, animals, objects or settings through advanced analysis.

One primary piece of functionality in the CNN is feature detection. First, the face must be identified within the image context, so that the facial features can be analyzed. Methods such as the Viola-Jones are used to break down an image through color shift and local analysis of group pixels to find features like noses, ears, eyes, etc. The same facial recognition neural networks will often utilize ratios—such as the ratio from eyes to hairline, from ears to nose, or other stock facial ratios that can help with facial recognition. The image is then compared to all known faces to uniquely identify the identity of that person.

So, with all this winning technology the facial recognition engine can be surprisingly adept at learning how to recognize a particular individual’s face in a crowd. Facial recognition software is applied in payment processing to substitute cards with faces, for access and security purposes, and to identify criminals.

Primarily, companies that have used abundant public Internet images to pull together training sets for sophisticated facial recognition programs face blowback and resistance from some of their customers, including law enforcement departments, and from U.S. legislators, consumer advocates and citizens at large.

1. What are paragraphs 2 and 3 mainly about?

A．How facial recognition works technically.

B．How facial recognition is applied in society.

C．When facial recognition gets increasingly significant.

D．What the primary function of feature detection is.

2. How can facial recognition engine recognize individual’s face?

A．By comparing the image to all known faces.

B．By learning how to recognize a particular face.

C．By using convolutional neural network.

D．By identifying face within context.

3. What may be some customers’ attitude towards companies using facial recognition?

A．Positive.	B．Negative.
C．Ambiguous.	D．Indifferent.

4. From the passage, we know that ________.

A．facial recognition is a new debatable world technology

B．convolutional neural network is intended for feature detection

C．facial recognition is mostly employed to identify criminals

D．there’s still need for facial recognition to prove accuracy