2 . 假设你是李华，针对当前学生的近视问题，你代表学生会发出了“保护眼睛”的倡议。内容包括：
1. 目前学生的近视现状；2. 保护眼睛的具体措施；3. 呼吁同学们保护眼睛。
注意：1. 词数应为80字左右；
2. 可以适当增加细节，以使行文连贯；
3. 倡议书的开头和结尾已经给出，不计入总词数；
4. 参考词汇：myopia n. 近视 short-sighted adj. 近视的
Dear fellow students,
_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Students’ union

3 . Back pain can make it difficult for many people to function in everyday life.     1     If you suffer from back pain, read on for four everyday fixes.

Our bodies need adequate movement throughout the day to avoid the stiffness that contributes to aches and pains. If the weather is good, don't hunt for the nearest parking spot; don't take the elevator when you have the option of one or two flights of stairs. When you need to sit for long periods, set a timer to get up every hour and be active for just a few minutes.     2    

When we overuse our dominant side, we create muscle patterns of weakness and tension that increase pain, especially in our backs. Consider the actions you take repeatedly throughout the day that shift your weight to one side.     3     And use your opposite hand every so often for basic activities, such as opening doors.

Psychological stress is a noted risk factor for back pain, according to research. Most mental stress is caused by focusing on the past or future.     4     A few minutes a day of mindfulness can go a long way toward minimizing the impact of stress. Additionally, mindfulness practices like tai chi have all shown effectiveness in reducing back pain.

    5     That is, you can create a game plan of daily activities to practice for back health. If your back hurts at the end of the day, don't just decide it was a “bad” day. Ask yourself if you practiced the activities to help you avoid the stress and tension. Taking an active, daily-life approach to maintaining a healthy body is the key to keeping back pain at bay.

A．Switch sides when you carry things.

B．It affects how you move, feel and think.

C．You should learn more about the cause of your pain.

D．Approach the health of your back as a responsibility.

E．So actively being mindful of the present reduces stress.

F．You'd better take a quick break to check in with your breathing.

G．More minutes of movement add up to big health benefits over time.

4 . Which of Mary’s arms was hurt?

A．The left one.

B．The right one.

C．Both.

5 . Perhaps you use your headphones to enjoy music and peace and quiet during the day. But you may be neglecting the dangers of hearing loss with headphones.     1     This is 30% higher than just 20 years before, and experts are pinning it on headphones.

In fact, headphones are not a bad thing. They can bring peace, allow for better musical enjoyment, and even protect your ears from higher decibels(分贝).     2    

How long should you wear your headphones every day? The answer is, according to the World Health Organization, one hour per day.     3     But the fact is that the longer you listen, you’re going to lose your hearing sooner. To keep hearing loss from happening to you, you should follow the recommendation in place by the WHO that you keep your time with headphones on limited to one hour per day.

Then, how do you set the safest volume for your headphones? With headphones, it depends on the type you’re using and your environment. To test things out, you should take them off your ears and extend them in your hands out in front of you.     4     If you are using open-back headphones, you should try to have a conversation with someone nearby. When you’re able to carry on the conversation clearly, you’re listening at a proper volume. But do remember that never raise the volume on your listening device over 60% of the maximum!

    5     At others this loss will build up over time. It usually isn’t noticeable in the beginning. It’s not until it’s too late that most people realize that the damage has been done. The only way to know for sure is to consult your doctor.

A．This might seem unreasonable to you.

B．At times, hearing loss isn’t permanent.

C．l in 5 teens will have some types of hearing loss.

D．What’s more concerning is what that means for children.

E．It’s the duration and volume that cause the problem, however.

F．If you still hear your music clearly, you need to turn them down.

G．It’s a wonderful thing to shut out the rest of the world and enjoy your music.

8 . Where would you be without your legs and feet? They do a lot to get you where you need to go.

But sometimes, kids have problems with these important body parts. Their legs and feet might look different or might not work exactly the way they should.     1     They either go away on their own or the kid learns to handle them by using stuff like special shoe inserts.

Pigeon Toes

Pigeon toes, or inwardly turning toes, is a common foot condition in kids. It occurs when the front of the foot is turned inward, facing the other foot.     2     Most kids’ feet straighten naturally without any medical treatment.

    3    

When someone stands with the feet and ankles together but the knees widely apart, we call that being bowlegged. Many babies are born bowlegged because their legs were folded tightly across their bellies while they were growing inside their mom. Bowlegs usually straighten once babies with this condition start to walk and their legs bear weight. By the age of 3, most kids grow out of the condition.

Knock-Knees

Knock-knees is a condition where the legs curve in at the knees so much that the ankles are separated.     4     But around the age of 6, the body begins to straighten naturally, and within a few years most kids can stand with their knees and ankles touching at the same time.

Flatfeet

    5     Rise up on your toes. Can you see the arch in the bottom of your feet? Most of us have some sort of arch on the bottom of the feet between our toes and heel. Someone who doesn’t have this curve might have flexible flatfeet.

A．Bowlegs

B．Full Arch

C．Stand sideways in front of a mirror.

D．Boys and girls both experience pigeon toes.

E．In other words, if your feet are flat, they’re fine!

F．The good news is that these problems usually aren’t serious.

G．Lots of kids become knock-kneed between the ages of 3 and 5.

10 . An international team led by scientists at the Hong Kong University of Science and Technology (HKUST) has recently developed the world's first 3D artificial eye with capabilities that even outperform those of the human eyes, bringing vision to humanoid robots and new hope to patients with visual damage.

Scientists have spent decades trying to produce the exact copies of the structure and clarity of a biological eye, but vision provided by existing artificial eyes with external wires are still in poor resolution (分辨率) with 2D flat image sensors. The Electrochemical Eye (EC-Eye) developed at HKUST, however, may actually offer sharper vision than a human eye, with extra functions such as the ability to see things in darkness.

The key feature allowing such breakthroughs is a 3D artificial retina (视网膜), made of nanowire light sensors which are like the photoreceptor in human retinas. The scientists connected the nanowire light sensors to some liquid-metal wires serving as nerves behind the human-made retina during the experiment, and successfully carried out the visual signal transmission to reflect what the eye sees onto the computer screen. In the future, those nanowire light sensors could be directly connected to the nerves of the visually damaged patients. Apart from that, the artificial retina can receive more light signals and potentially attain a higher image resolution than human retina.

With further adjustment, the EC-Eye can be a self-powered image sensor, so there is no need for external power source, which will be much more user-friendly as compared with the current technology. “The current artificial eyes are still of no match to the human eyes. A new technology is in urgent need, and it gives me a strong motivation to start this unconventional project. In the next step, we plan to further improve the performance of our device. Animal and clinical trials are now being planned. I think if everything is on track, perhaps in five years, the technology will become practical,” said Prof. Fan, whose team has spent nine years to complete the current study.

1. What's the feature of the EC Eye?

A．It uses 2D flat image sensors.	B．It performs better at night than in the day.
C．It is attached with external wires.	D．It provides a clearer vision than human eyes.

2. What's the function of nanowire light sensors?

A．To send computer signals.	B．To serve as nerves behind the retina.
C．To receive visual signals.	D．To connect nerves of patients to the wires.

3. What can we infer about the EC-Eye from Dr. Fan's words?

A．It is of no match to human eyes.	B．It has been improved by the team.
C．It will be in clinical trials in five years.	D．It is different from the previous devices.

4. What can be the best title for the text?

A．EC-Eye will become popular in the near future.

B．Nanowire light sensors help people see in darkness.

C．3D technology helps to cure people of their eye diseases.

D．Scientists have developed first artificial eye with 3D retina.