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.

Now smart phones and computers are getting thinner than before.1 , in the future, you might not take them everywhere with you. You may just need to2 a pair of glasses. The glasses will act like a computer3 and show you information from the Internet. When you're visiting an art museum, you'll be able to see information about the famous4 in front of you. Wearing the glasses, you'll be able to get a review （评论） of the restaurant menu before you 5 . The glasses will also have a camera （照相机） to take photos. All in all, smart glasses make your life much 6 .

In the future, mirrors will be able to do much more for you. When you7 your teeth in the morning, you'll be able to watch the news on your mirror.8 your hair is short and you wonder what you'll look like with long hair, you can just talk to your mirror. Then you'll see yourself with 9 features（特征）. Your mirror will also show your 10 , and it'll be able to tell you when you need a visit to the doctor's office. 

At times, some teenagers love their idols (偶像) blindly and try to copy the hair or clothing style of the stars. This reflects their lack of (缺乏) self-confidence. {#blank#}1{#/blank#}The key to standing out is to build your body confidence. That's really necessary for teenagers. 

{#blank#}2{#/blank#}It's about accepting and being kind to yourself. Research has shown that feeling good about your body can make you do much better in working and learning. But you don't need to fix on the outside of your body. After all, the look is only a small part. An expert on development of teenagers named Jade said, "{#blank#}3{#/blank#}If you spend much time on the so-called ‘perfect look', you will have less time to do something more meaningful."

To improve body confidence, Jade gives the teenagers some advice. 

● Don't talk anything bad about yourself or others. 

● Focus on the things you do well in. {#blank#}4{#/blank#}

● People like you for many reasons. {#blank#}5{#/blank#}And always tell yourself you are becoming better. 

● Learn more knowledge to make you open-minded and believe in yourself.

How can you learn about a city? City walks might be a great choice. Instead of simply {#blank#}1{#/blank#} around, city walkers follow some ways on different themes. Along the way, they enjoy the views, take photos, listen to the guide and take part in fun activities.

City walks are more and more {#blank#}2{#/blank#} in China. Not only travelers but also locals are becoming interested {#blank#}3{#/blank#} this. For travelers, it allows {#blank#}4{#/blank#} to deeply explore(探索) a city. For locals, it's a good chance to see something they haven't noticed before.

Zhang Xiaoxin,a college student, is a new comer to Changsha. By taking part in a city walk, she saw more closely {#blank#}5{#/blank#} the locals' daily lives were like. Unlike Zhang. Wang Yixuan {#blank#}6{#/blank#} up in Changsha. Thanks to city walks, she has visited places that she heard about before but {#blank#}7{#/blank#} set foot on. As the guide introduced the {#blank#}8{#/blank#} of these sites, she knew more about the city's past." Living here for over 20 years,I thought I was familiar with it enough,{#blank#}9{#/blank#} city walks let me see other sides of the city.

For many people, city walks are not just a way to travel but can be a part of their daily lives. Come on! Just start to observe (观察) everything around you whenever you walk, from your school or company to your home. You' ll always find {#blank#}10{#/blank#} surprising!

Flu season is coming!Are you prepared？Here are answers to your question!

{#blank#}1{#/blank#}

The flu is a virus（病毒） that passes easily from person to person.Usually the flu appears in winter and the rainy season.

{#blank#}2{#/blank#}

In fact，they come from different viruses.Although the symptoms（症状） can be almost the same，flu symptoms are more serious.Cold symptoms only last about seven days while the flu can last two weeks.

{#blank#}3{#/blank#}

The seasonal flu is very common all over the world.Children，old people and people in poor health catch the flu easily.In the United States，five to twenty percent of the people pet the flu every year.

{#blank#}4{#/blank#}

The flu is pretty dangerous.It can give you fever（发烧） or even make you die.Every year in the U.S.，36

{#blank#}5{#/blank#}

There are many things you can do to keep healthy and stay away from the flu.For example，wash your hands often.Moreover，don't touch your eyes，noses or mouth with your dirty hands.

Hello! My name is Nancy White. I'm 14. I'm a new student in Miss Lin's class, Class 4. She is very nice. There are 16 boys and 12 girls in my class.

____His name is Musio. He is a robot(机器人). He can speak(说）English very well. And he can spell many words for me. So he can be my English teacher, too.

I want to make friends with you. Do you want to be my friend? Please call me. My telephone number is 582306. Or you can write to me at nancywhite@sina. com. Thank you.