We always think that it's OK for us to leave our plants home during our vacation as plants won't scream like pets, right?

    A recent study done by a group of scientists at the Tel Aviv University has discovered that some plants will scream when they are under stress.

    The research was carried out on tomato plants and tobacco plants by cutting their stems (茎) and depriving (剥夺) them of water. A microphone was placed 10cm away from them. When their stems were cut, the plants started "screaming" between 20 and 100 kilohertz, and the scientists guess that this scream is probably meant to warn other plants nearby.

    When the tomato plants' stems were cut, 25 ultrasonic (超声的) pain sounds were recorded in an hour, and at the same time, 15 ultrasonic pain sounds were recorded from the tobacco plants. When they were deprived of water, the tomato plants recorded even more pain sounds with 35 pain sounds in an hour while the tobacco plants recorded about 11 pain sounds.

    The plants also acted differently to different kinds of stresses. For example, the tobacco plants gave out a stronger "scream" when they were deprived of water than when their stems were cut. But plants that were in no immediate (立刻的) danger gave out less than one ultrasonic sound per hour.

    The group of scientists said that plants are not as quiet as we had always thought, but in fact their voices are so high-pitched that we just can't hear them.

    Last year, another study has found out that plants feel pain when they are touched or hurt and they will give off a terrible smell.

When people think of healthy foods for eyes, they think of carrots. Yes, carrots are good for eyes. But there are also many other healthy foods for eyes. If you want to have healthy eyes, eat them.

Kale

Kale is a dark green vegetable. It looks like a cabbage. If you eat kale often, you will still have healthy eyes when you are old. And the vitamin (维生素) A in it can help you see well at night.

Chicken

Chicken is great food for eyes. And you can cook it in many ways. You can cook chicken soup, gongbao chicken, chicken noodles and chicken salad. All of them are delicious.

Fish

If you spend lots of time on the computer or often feel you have dry eyes, you can eat some fish. You don't need to eat a lot each time. A little will be OK.

Now people have more money than before, and they want to enjoy life. {#blank#}1{#/blank#} Listen! Some people are talking about their vacation plans.

 "I love sports. I'm going bike riding with my family on vacation. {#blank#}2{#/blank#}That's really great," said Mrs Lee Mr Zhao loves nature. He said. "I'm walking in the countryside or going hiking in the mountains. {#blank#}3{#/blank#}." Miss Wang wants to be more beautiful. "I'm planning to go shopping {#blank#}4{#/blank#}"Zhang Yishan is a movie actor. He has just finished his last movie. {#blank#}5{#/blank#}He said, "I like going sightseeing I am saying in Canada for a month."

 A relaxing vacation! I can't wait! 

A. I want to buy lots of beautiful clothes. 

B. Now he really wants to get some rest,

C. Many people can come to buy clothes in my shop.

D. We can exercise and enjoy lots of interesting places.

E. But a lot of people like traveling in the countryside.

F.I hope the beauty of nature can help me to forget all of my problems.

G. So people have difference ideas about how to enjoy their vacations.

Big schoolbags have been a big problem for students for a long time. Maybe 1 schoolbag is too heavy to carry, and it troubles you a lot2 you want to take out a book to read. Now e-textbooks will 3 you.

It is said that many Chinese middle schools are going to use e-textbooks. An e-textbook, in fact, is a small computer 4 students. It is much lighter than a usual schoolbag and5 to carry. Though it is6 small as a book, it can hold(容纳) everything for study. The students can read the text page by page on 7 screen, take notes 8 the special "pencil", or even "hand in" homework to their teachers by9 emails. All they have to do is press a button(按开关).

Some people say e-textbook are good,10 some say they may be bad for the students' eyes. What do you think of it?

Do you know the word "metaverse（元宇宙）"? The metaverse is a virtual world. We can come in it, not just looking at it on a screen. You should wear special things in it, like glasses and gloves. They can help you see, hear and touch（触摸）. 

In this virtual world, you can do many things, like in your real life（真实生活）. Are you tired of（厌倦） taking classes at home? Let's go to a virtual classroom! It looks like a real classroom at school. You can ask your teacher questions and talk with your classmates. After class, you may want to have fun. Then you can go on a virtual trip（旅行）with your friends. You can play sports together. 

Do you want to take a virtual trip to the moon（月球）? You can also do this in the virtual world. That is cool, isn't it?