1 . If you were to lift up the keys of your keyboard, and take a look below, you’d probably be met with a terrible scene. “We clean our homes but most of us never think to clean our keyboards,” Rebecca Park, an advanced practice nurse, says.

“Our keyboards can actually hold high levels of bacteria (细菌),” Park says. “The most common bacteria that are found on our keyboards tend to live on our skin, mouth, and nose. These are then carried to our keyboards, usually by our hands.”

And according to one study, this is more likely when many people use the same keyboard, and each brings their own bacteria to the table. That said, touching bacteria-covered surfaces all day long, and then touching your face, can impact your skin. “Dirty electronic devices are a common cause of more acne (粉刺) breakouts,” Dr Yoram Harth explains.

In another study, researchers collected samples (样本) from 300 keyboards and found that all of them had bacteria. “The authors concluded that the presence of infective (感染性的) bacteria on these objects indicates that they might be a cause for the spread of skin infections,” Harth says. “Similar overloads of bacteria were also found on smartphone touch screens and computer mice and headphones.”

It’s not something you necessarily have to think too much about, but it never hurts to be aware of surfaces with bacteria, and take a few extra prevention steps. “A good way to prevent the spread of infection from your keyboards is to wash your hands before and after using the computer,” Park says. “Soapy water is effective enough to kill most bacteria.”

Do this, and you won’t carry as much bacteria to your keyboard, and then back to your face, and so is the opposite. It can also ensure you won’t be clogging your keys with bits from food, especially if you get right back to typing after eating lunch.

1. What do the two studies find?

A．Most people never clean their keyboards.

B．Most of the bacteria on the keyboards are harmless.

C．Most acne breakouts are related to the keyboard use.

D．Most electronic devices have bacteria on their surfaces.

2. Which way is suggested in the text to avoid the spread of bacteria?

A．Clean the keyboard with soapy water.

B．Wash hands after using the computer.

C．Wear gloves when using the computer.

D．Avoid eating before using the computer.

3. What does the underlined word “clogging” in the last paragraph probably mean?

A．Blocking.

B．Improving.

C．Destroying.

D．Replacing.

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

A．Useful Tips on Choosing a Proper Keyboard

B．Practical Ways to Protect Yourself from Bacteria

C．What You Should Keep in Mind About Infection

D．What Happens When You Don’t Clean Your Keyboard

2 . Benefits of Walking in Cold Weather

As winter blankets the world in a coat of ice and fresh cold air, the idea of going outdoors fora walk might seem less attractive.     1     Walking in cold weather comes with a lot of health benefits that might just make it the perfect season to put on your shoes and hit the roadway.

Strengthened Immune System

Remaining in colder temperatures can actually improve your immune (免疫的) system. As your body adapts to the cold, it produces more white blood cells.     2     Regular cold-weather walks might help make a strong er immune reaction, letting you stay healthier throughout the winter season.

High Spirits

The winter blues, also known as Seasonal Affective Disorder (SAD), can affect many individuals during the colder months. Fortunately, walking in cold weather has been linked to improved emotion and reduced signs of sadness. The fresh air and physical activity inspire the production of endorphins, the body’s natural emotion enhancers (增强剂).     3    

Improved health and energy level

Cold-weather walking can provide an excellent heart workout. The combination of light movement and the body’s reaction to the cold increases heart health by improving circulation (血液循环) and lowering blood pressure. Over time, this can make your blood system healthier.

    4     Instead, walking in the fresh air can make your senses energetic and increase overall energy levels. The physical activity and stay in natural light work together to reduce feelings of tiredness, leaving you feeling more active and ready to deal with the day.

So, as the winter winds blow and snowflakes fall, consider wearing your warm clothes and taking a walk outside.     5     It is also helpful to mental wellbeing and overall energy.

A．The cold weather does not cost energy.

B．They play a key role in fighting off diseases.

C．Winter, especially, is an opportunity to go slowly.

D．They leave you feeling more positive and excited.

E．However, don’t let the cold temperatures prevent you.

F．Let each walk be a big step towards a healthier, happier you.

G．The benefits of walking in cold weather go beyond physical health.

3 . Maybe you plan to ring in 2023 with a new resolve to lose weight, exercise more, not sweat the small stuff. And maybe these resolutions sound familiar — maybe just like the ones you made a year ago! So how can you ensure that your determination to get healthier in 2023 sticks?    1    

Dream big. Want to compete in a marathon or triathlon? Lose 50 pounds or just enough to fit into clothes you once loved? With perseverance (毅力), encouragement, and support, you can do it.     2    Many will cheer you on. Some will be happy to help in practical ways, such as by training with you or taking on tasks you normally handle in order to free up your time.

    3    Any time you fail to make a change, consider it a step toward your goal. Why? Because each sincere attempt represents a lesson learned. When you hit a snag (碰钉子), take a moment to think about what did and didn’t work. Maybe you took on too big a challenge?     4    

Give thanks for what you do. Set your sights on finishing that marathon,not on running it. If you compete to complete, you’ll be a winner even if you wind up walking as much as you run. With exercise — and so many other goals we set — you’ll benefit even when doing less than you’d like to do.     5    If your goal for Tuesday is a 30-minute workout at the gym, but you only squeeze (挤出) in 10 minutes, feel grateful for that. It’s enough. Maybe tomorrow will be better.

A．Learn from the failures.

B．Avoid repeating past failures.

C．Any activity is always better than none.

D．An ambitious aim often inspires others to help you.

E．Try the following tips to help you create long-lasting change.

F．Having a solid system can help you stay motivated and accountable.

G．If so, change into a less ambitious challenge, or break the big one into tinier steps.