相关试卷

March 20 is World Oral (口腔) Health Day. It's a time to focus on the importance of good oral health. .

Why is oral health important?

It's more than just about having a healthy mouth. Our mouth is the first place where food goes, and it holds bacteria (细菌). . And our mouth affects our confidence, too. Problems like bad breath or misaligned (不整的) teeth can make us want to avoid socializing.

What are some common oral problems faced by teenagers?

. Signs of it are teeth with dark spots or teeth that hurt when eating hot or cold foods. Tooth decay (蛀牙) can harm the tooth nerve and the life of the tooth. Then there's periodontitis (牙周炎), known as gum disease (牙龈疾病). It often happens when you don't take good care of your mouth and teeth. ?

It's best to brush your teeth for three to five minutes at a time. But it's best not to brush your teeth for more than five minutes. Because it can hurt your gums. Brush your teeth two to three times a day. The most important time is in the evening when you brush your teeth before bed.

Do I need to use dental floss (牙线) and mouth wash every day?

For dental floss, it depends. If you have straight teeth with few gaps (缝隙), flossing once a week is enough. .

Mouthwash, on the other hand, shouldn't be used for a long time. Generally, it has some disinfectant (消毒剂) in it. Using it for a long time will hurt the natural balance of bacteria in your mouth and lead to gum problems.

A. If not, use dental floss daily.

B. Teens interviewed a dentist to share with us some tips on oral health.

C. How many times a day should I brush?

D. Keeping our mouth clean and health y helps our stomach work well.

E. Tooth decay is one oral problem.

People have long been dreaming of living on Mars one day. But Mars doesn't have enough oxygen (氧气) for us to breathe! Luckily, some smart scientists from China worked with a robot called the "Machine Chemist" to find a way to make oxygen on Mars. Together, they found a catalyst (催化剂) that helps make oxygen faster with less energy.

As we know, Mars has a little bit of water, and scientists have found a way to use sunlight to get oxygen from the water. But here's the difficult part: They needed a catalyst to speed up the process, and bringing the catalyst from Earth to Mars would be expensive. That's why the "Machine Chemist", known as Xiao Lai, comes in.

Xiao Lai is smart and can learn, think, and do experiments. It has read over 50,000 scientific papers before it found the perfect method for the catalyst. Can you imagine how many combinations (组合) scientists had to try? More than 3.76 million! It would have taken humans thousands of years to test them all, but don't worry — Xiao Lai did the job in six weeks!

The scientists are excited about this breakthrough (重大进展) because it opens up new chances for exploring (探索) space. This discovery is a huge deal because it means we can make oxygen on Mars without bringing everything from Earth.

Yang Zhiyang is a 23-year-old boy from Baoji, Shaanxi Province. He has become an example for young people as he works full-time to take care of his mother, who has ALS (渐冻症). Yang's mother, Su Jing, got ALS in 2010 and she couldn't do normal things easily. Because Yang's father had to work for long hours to make money, Yang started to take care of his mother after finishing college in 2020.

Because of the disease, Yang's mother needs help with almost everything. She needs to be carried up and down the stairs. She also has difficulty speaking. She can still type on her mobile phone, but most of the time, she chooses to communicate with her son in another way.

"My mother and I use eye contact (接触) for most of our communication," Yang says. "For example, when she wants to sleep, she uses her eyes to show that she is tired, and she turns her head towards the bedroom. And when she needs water, she will look at the water cup on the table."

For many things, Yang has to be very careful, including helping her mother bathe and use the toilet. Though the work is difficult, Yang enjoys all the time he spends with his mother. He accompanies (陪伴) her every time she exercises. To make it more fun, he often sings to her.

Yang's love for his mother has touched many people. But Yang says it's only natural that he should take care of his mother. "My mother brought me up. I'm just doing what a son should do," he says.

1.保护环境的重要性；

2.学生如何低碳生活；

3.发出倡议。

注意：

1.词数100左右；

2.可适当增加细节，以使行文连贯；

3.请按如下格式在答题卡的相应位置作答。

Dear fellow students,

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Yours sincerely,

Li Hua

Following the tradition of wearing new clothes during the Chinese New Year, young people in China took the purchase of hanfu to a new height and made a huge hit. During this year's Spring Festival holiday, young people (dress) in hanfu, the traditional clothing of China, could be seen in many places around the world.

An initiative (倡议) launched in late January by Xiaohongshu, a social media platform, invited users (upload) photos or videos of themselves wearing hanfu at landmarks around the world. In the first two weeks of initiative, about 10,000 Xiaohongshu users shared their photos taken from around 30 countries and regions worldwide. One user even posted photos from Antarctica. Many supporters held the belief that it was a strong sense of national pride inspired them to wear hanfu.

Hanfu, along other traditional forms of Chinese costume, has gained extreme popularity in recent years. Many universities in China have a hanfu society where members wear hanfu to celebrate traditional Chinese festivals. The "new Chinese style", combines traditional Chinese elements with modern designs, has developed into a fashion trend among the younger generations not only in China but also (global).

Analysts claim that the rise of "China chic" demonstrates young Chinese people's (confident) in their own culture. Wearing Chinese-style costumes (reflect) the wearer's Eastern temperament and showcases Chinese aesthetics (美学) to the world.

As the year went on, I3 to see more of the beautiful northern forest, so I branched out and4 travelling to Prince Albert National Park a couple of times a week. During these5, I have had several amazing wildlife encounters (邂逅).

Later that year, I picked up my first camera. I soon fell in love with6 and I could hardly bear to put my camera down.

In the following years, I've spent every weekend out at the park.

One of the most unforgettable7 I've had in the park began in 2013, when I8 a fox (狐狸) with a mark on his right ear. I ran into this9 fox again in 2014, while he was walking down the road, and then again in 2015, while he was sitting under a tree. I10 those areas in 2016, hoping to11 him again, but Prince Albert National Park is a big area and I haven't12 him since. I am hoping we will have another chance13.

The time I've spent on the outdoors has14 so much more than great photographs and wildlife encounters. It has allowed me to become15 again and reconnect with nature. For these experiences, I am really thankful.

Innovations in technology have led to the birth of many new methods of electronic communication, such as social networking websites and video conferences (视频会议). Online social media like Facebook and Instagram allow people to keep in touch even if they are thousands of miles distant from each other.

With the rise of remote work, people can now work from anywhere in the world. Collaboration (合作) tools like video conferencing and team messaging apps have made it easier for teams to work together, regardless of their location.

Advances in technology have also made online shopping more popular now than ever. Instead of wasting their time in the shopping mall, they rely on technology for a more convenient and time-saving shopping experience.

Besides, technology has reformed education. In the past, people would have to physically go to class, attend a meeting or go to the library to do research. We can access vast amounts of information on any topic. It becomes easier than ever to stay informed and educated.

Furthermore, technology has made a positive impact on the daily lives of people. Think about the introduction of self-driving cars: they were unheard of a few years ago, but now they're a reality. This innovation has greatly facilitated the efficiency of transportation.

A. Technology has improved communication.

B. Nowadays, many people prefer shopping online.

C. Technology has changed the way we entertain ourselves.

D. Now online courses have made education easily available.

E. This has led to increased productivity in various occupations.

F. Positive examples include improvements in the transportation system.

G. We can expect further exciting advancements as technology evolves.

The sleep cycle during our deepest sleep lasts for several minutes, but in birds, it lasts hardly 10 seconds; they will keep one part of their brain awake, which you might notice when a bird has one eye open. This will allow birds to run away from a hunt at a moment's notice, even when they're in the middle of a sleep.

To fall asleep, a bird's body goes through a series of changes, one of which is that the muscles lose their hardness, which happens as a main result of reduced brain control of muscle movement. To stand perfectly balanced on a branch while the muscles become weak isn't easy. Anyone who has tried to sleep while standing on a train would know this. So when a bird lowers itself, its talons (爪子) automatically and involuntarily bend and hold on tightly to the branch, and until the leg is straightened, the talons will not relax. The key behind this mechanism (机制) is the bird's flexor tendons (屈肌腱) that connect muscles to bones. The flexor tendon stretches, thus bending the bird's toes.

But a recent paper found that sleeping European starlings (a common bird found in North America and Europe) don't use the mechanism. The researchers observed that the birds bent their knees only slightly, not enough for the mechanism to kick into action. The toes, as a result, were largely unbent, and the birds balanced on the central part of their feet while they slept.

"Birds are varied and unique, exhibiting different bodies, physiologies, and behaviors depending on which species, genus, or family one studies. Sleep cycles differ just as widely. While we may not know the whole story yet, there is no denying that it is remarkable that birds manage this balancing act daily!" said Salama, who has a degree in life sciences and biochemistry from St. Xavier's College, Mumbai.

Study lead author Julia Wolfson, associate professor in the Department of International Health at the Bloomberg School, and her co-authors wanted to test how labeling climate change impacts of fast food menu items might lead people to choose less red meat. Eating too much red meat has been linked to many health problems. Eating less red meat would also help lower greenhouse gas emissions (排放).

More than 5,000 participants were shown a sample menu and asked to choose a single item for dinner. One group of participants received a menu with non-red meat items such as chicken sandwiches labeled "low climate impact". Another group received a menu with red meat items— burgers labeled "high climate impact". A third control group received menus without climate labels.

Both the high and low climate impact labels markedly reduced red meat choices compared to the control group. Menus with a high climate impact label on burgers increased non-beef choices by 23 percent compared to the control group. Menus that included low climate impact labels increased non-beef choices, such as a chicken sandwich or a salad, by about 10 percent more participants than those in the control group. "These results suggest that menu labeling, particularly labels warning that an item has high climate impact, can be an effective strategy for encouraging more sustainable (可持续的) food choices in a fast food setting," says Wolfson.

While encouraging on the whole, the results suggest that positive "low climate impact" labels are less effective in encouraging sustainable food choices compared to "high climate impact" labels. At the same time, climate labels may have the unwanted side effect of making a choice seem healthier than it actually is.

"An undeserved health halo (光环) given to unhealthy menu items could encourage people to overeat them," Wolfson says. "So we have to look for labeling strategies that create ‘win-wins' for encouraging both more sustainable and healthy choices."