Some days, don't you think, "Wouldn't it be nice if the laundry would just do itself?” Self-cleaning clothes may sound crazy. But Australian researchers have found a way to make something like this possible!

    A team at RMIT University in Melbourne, Australia, found a way to put special nanostructures (纳米结构) into clothing, which can then clean the clothes. When sunlight hits the nanostructures, they break down the dirt and stains (污渍) that don't belong on your clothes.

    The nanostructures don't break down the actual clothing because cotton and the other clothing materials are too strong to be broken down. According to CNN, the researchers cover the clothing in a solution made of silver and copper (铜) nanostructures. All it takes is 40 minutes of sunlight and your clothes will look as good as new.

    So if you spill on yourself during lunch, you can step outside for a walk, and it will be clean by the time you go inside. It not only makes your life easier, but it can also be good for the environment.

    According to the US Department of Energy, the average load of laundry uses about 25 gallons (about 94 liters) of water. Water is a very important resource, so using less of it to wash clothesis better for the environment. But one of the scientists at RMIT University knows more needs to be done.

    “There's more work to do before we can start throwing out our washing machines,” said Dr Rajesh Ramanathan, “but this is a strong foundation .”

    So what's the next step? Ramanathan wants to either start selling the solution by itself or convincing clothing makers to treat the clothing with the solution while clothes are being made.

Suggested questions:(1) When will you have your birthday party?(2) Who will you invite to your birthday party?(3) What will you do at your birthday party?(4) Where will you have it?

Inventions are very important and they can easily change our life. The followings are some great inventions. 

If you finish your homework quickly after lunch on weekends, you and your friend decide to visit a bookstore. Here are some suggestions for you. 

It's the weekend. Go to a bookstore with friends!

1. Before leaving home, it's important to give your parents a call. Let them know where you are going, who you are going with, and when you plan to return. 

2. After meeting with your friend, you walk to the bookstore. You need to walk on the sidewalk and wait for the traffic lights. You may talk with each other happily when walking. But always remember to watch for cars. 

3. The bookstore is very crowded! Try to stay with your friend. Don't chat with strangers. You may find some books interesting, but it is better to put them down and go back home before 9:30 pm. 

4. You may want to buy a burger for dinner. You can pay for it with your smartwatch or phone. If you need to enter the password (输密码), make sure no one else is watching. 

Mmm... chocolate smells so good. They make our mouth water. Where does chocolate come from?

Chocolate is made {#blank#}1{#/blank#} cacao (可可豆). Scientists {#blank#}2{#/blank#}( think) cacao came from Central America to Mexico {#blank#}3{#/blank#}3,900 years ago. But now scientists from Canada found that people in some {#blank#}4{#/blank#}( country ) of South America grew cacao. They firstly grew over 5,000 years ago.

Chocolate is popular around {#blank#}5{#/blank#} world. Let's {#blank#}6{#/blank#}( learn) more about this snack(零食).

The color of dark chocolate is dark brown. It has more cocoa butter(可可油). Cocoa butter is good for  {#blank#}7{#/blank#}( we) teeth(牙齿). White chocolate is very sweet. There {#blank#}8{#/blank#}( be) not any cacao in it. Many people think it is not a {#blank#}9{#/blank#}( really) chocolate. Milk chocolate has a mild flavor(淡味). It is light brown. It tastes sweet.

Some scientists say chocolate has too much sugar (糖 ) and this can give people bad teeth,{#blank#}10{#/blank#} others say eating chocolate makes people feel happy. Also, dark chocolate has less sugar and

fat. It is good for the heart. Guess what? I want to have a box of dark chocolate now!

Do you like exercise? Do you know something about plan k exercise(平板支撑)?

Plank exercise has become more and more popular in recent years. It requires little time. It's easy to do. What's more, doing plan k exercise often may bring you lots of benefits(益处). 

Performing plan k exercise as a daily home exercise before or after school will not only speed up your metabolism(新陈代谢), but also keep your metabolic rate high all day long. Doing the exercise often will make you burn lots of calories. This is especially useful if you have to sit in the classroom for hours every day. A high metabolic rate will help you lose weight and keep in good shape. 

Have you ever tried standing on one leg? You couldn't stand straight for more than ten seconds, right? It's not because you are drunk, of course. Instead, it's because your muscles(肌肉) aren't strong enough to give you the balance you need. Doing plank exercise often will improve your balance. Stronger muscles will also help you stand with straight posture(姿势) at all times. 

 ▲  Just think about it: You are sitting in your chair, at home or at school, all day long. Your muscles get tired, and your legs get heavy. Plank exercise will relax the muscle groups that may cause stress in the body. As a result, it can have a powerful and good influence on our mental(精神的) health. 

Considering all the benefits of plank exercise, will you make it part of your daily life?