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乌鲁木齐市达坂城区四校联考 2022-2023学年高二下学期英语开学考试试题

作者UID:9673734
日期: 2024-11-13
开学考试
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When a chunk of ice fell from a collapsing glacier(冰川)on the Swiss Alps' Mount Eiger in 2017, part of the long deep sound it produced was too low for human ears to detect. But these vibrations held a key to calculating the ice avalanche's(崩塌)critical characteristics.

Low-frequency sound waves called infrasound that travel great distances through the atmosphere are already used to monitor active volcanoes from afar. Now some researchers in this field have switched focus from fire to ice: dangerous blocks snapping off glaciers. Previous work has analyzed infrasound from snow avalanches but never ice, says Boise State University geophysicist Jeffrey Johnson. "This was different," Johnson says. "A signature of a new material has been detected with infrasound."

Usually glaciers move far too slowly to generate an infrasound signal, which researchers pick up using detectors that track slight changes in air pressure. But a collapse—a sudden, rapid breaking of ice from the glacier's main body—is a prolific infrasound producer. Glacial collapses drive ice avalanches, which pose an increasing threat to people in mountainous regions as rising temperatures weaken large fields of ice. A glacier "can become detached from the ground due to melting, causing bigger break— offs," says University of Florence geologist Emanuele Marchetti, lead author of the new study. As the threat grows, scientists seek new ways to monitor and detect such collapses.

Researchers often use radar to track ice avalanches, which is precise but expensive and can monitor only one specific location and neighboring avalanche paths. Infrasound, Marchetti says, is cheaper and can detect break—off events around a much broader area as well as multiple avalanches across a mountain. It is challenging, however, to separate a signal into its components (such as traffic noises, individual avalanches and nearby earthquakes) without additional measurements, says ETH Zurich glaciologist Malgorzata Chmiel. "The model used by Marchetti is a first approximation forthis," she says. Isolating the relevant signal helps the researchers monitor an ice avalanche's speed, path and volume from afar using infrasound.

Marchetti and his colleagues are now working to improve their detectors to pick up more signals across at-risk regions in Europe, and they have set up collaborations around the continent to better understand signals that collapsing glaciers produce. They are also refining their mathematical analysis to figure out each ice cascade's physical details.

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Visa Medical Appointment

For your appointment you must bring:

·Your valid original passport. Driving license is not accepted.

·HAP ID (体检号) and your e-Medical Referral Letter.

·Prescription glasses or contact lenses.

·Any specialist's reports about your medical condition.

At visa medical assessment

·A phone interpreter will be made available upon request.

·You will be required to change into a medical shirt provided for your visa medical assessment. We recommend that female applicants NOT wear a dress or clothing which is difficult to remove to the appointment.

·If you are having an x-ray, you will be asked to remove all necklaces and neck chains and tie long hair back. We request valuables not be brought to the assessment. Change rooms and lockers will be available to store your belongings, including your mobile phone which must be kept in a locker during your assessment.

Important information for your appointment

Blood Test

You are required to have a blood test, please eat and drink as normal before your appointment. There is no need to fast.

Arriving for your appointment

Please arrive on time for your appointment and allow approximately 2 hours for your assessment to be completed.

Pregnancy

If you are pregnant, please call our contact centre on 1300794919 as it may affect you being able to proceed with the assessment.

Menstruation (生理期)

If you have booked your appointment when menstruating, please go online to reschedule your appointment so it falls 4—6 days after you have finished menstruating.

For more information

Please visit our websitewww.bupamvs.com.au

Bupa Medical Visa Services Customer Service

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The key to a happy life has nothing to do with getting ahead at work, making money, or traveling the world. Instead, living your best life and creating meaning is all about one thing: relationships.

A study of adult development has been running at Harvard since 1938, and is now on its second generation of participants—the children of the original study's subjects. Over decades, the research team collected data about their lives, including their physical and mental health, marital (婚姻的) status and quality, career happiness, etc.

They found the most important aspect in how happy and healthy these men were over time was their relationships. In other words: Finding happiness in life is all about the people you love.

The research doesn't only include romantic relationships and marriage. Quality, close relationships are important whether they are in the situation of romantic relationships or closeness between friends or family members. The kind of relationship you have is less important than how close you feel with them.

However, the study only included men, and important gender differences exist in how people experience relationships. Some research suggests that men may benefit more from marriage. But they tend to have a harder time keeping friendships; as men get older, they will more likely say they have nobody to discuss important subjects with. So it's possible that having close relationships throughout their lives might affect men differently than women.

The findings line up with the effects of loneliness. People who are socially isolated have a greater likelihood of strokes (中风), heart attacks, and higher blood pressure, not to mention mental health issues.

Unfortunately for the youngest generations, recent surveys found that young Americans are lonelier than older generations. That will likely have a big impact on how healthy and happy people feel throughout their lives.

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Top tips for students doing voluntary holiday work

I have had some of the best and worst experiences of my life doing volunteers projects. Having taken part in a few such programs before, here are some tips I have picked up.

Many of these schemes are advertised on legal websites, but even these can have hosts who take advantage of them. These people will advertise something that simply isn't true and when you arrive the arrangement may be different from what you expected.

Choose somewhere with a lot of positive reviews.

Many sites that advertise work projects have a space for reviews. Reviews tend to mean people have been there. Again, be cautious because reviews can be faked. Besides, what one person loves may not be your cup of tea.

Bring a friend or a few.

And it's good to have a partner if you end up in a difficult situation. Try to find a friend with some good skills to travel with you. Trade skills can be very useful.

In one place where I volunteered, a team member complained about having to work a few hours a day. He didn't seem to realize it was a small(or no)price to pay to live in a hotel with food and a swimming pool for free.

If you find a good place, don't move on too soon.

If you like the work and you're getting free food and accommodation, why leave?

Anyway, volunteering is an amazing experience. Enjoy it.

A. Only go if you intend to work.

B. Learn the language of where you are going.

C. It can be nice to have a familiar face around.

D. And positive reviews indicate people enjoyed it.

E. The grass isn't always greener on the other side.

F. Don't believe everything you read on the Internet.

G. People are likely to ask you to help them with their projects.

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