When the weather is hot, you go to a lake or an ocean. When you are near a lake or an ocean, you feel cool. Why? The sun makes the earth hot, but it can not make the water hot. Though the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth goes up, then the cool air over the water moves in and takes the place of the hot air. When you are near a lake or an ocean, you feel the cool air when it moves in. You feel the wind and the wind makes you cool.

    Of course, scientists cannot answer all of our questions. If we ask "Why is the ocean full of salt?" scientists will say that the salt comes from rocks. When a rock gets very hot or very cool, it cracks (崩裂), and rain falls into the cracks. The rain then carries the salt into the earth and the rivers. The rivers carry the salt into the ocean. But then we ask "What happens to the salt in the ocean? The ocean does not get saltier every year." scientists are not sure about the answer to the question.

    We know a lot about our world. But there are still many answers that we do not have, and we are curious(好奇的).

A

    What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope for about the future? Scientists think that life will probably be very different in 2050.

    First of all, it seems that people won't use TV channels by 2050. Instead, people will choose a program from a "menu" and a computer will send the program directly to the television.

    Water will become a very serious problem. We'll need much more water, but there won't be enough. Some scientists think that water would be the cause of war.

    Cars will run on new clean energy and they will go very fast. And there won't be any accidents with the help of computers. On the other hand, space planes will take people around the world in two hours.

   Robots will work in factories instead of people. Many factories have already used robots. Big companies prefer robots—they do not ask for money, and they work for 24 hours a day.

    In a word, by 2050, our life will change a lot and our future will be quite different from now.

    The idea of being able to walk on water has long interested humans greatly. Sadly, biological facts prevent us ever accomplishing such a thing without artificial aid-we simply weigh too much, and all our mass pushes down through our relatively small feet, resulting in a lot of pressure that makes us sink.

    However, several types of animals can walk on water. One of the most interesting is the common basilisk Basilicus basilicus, a lizard(蜥蜴) native to Central and South America. It can run across water for a distance of several meters, avoiding getting wet by rapidly hitting the water's surface with its feet. The lizard will take as many as 20 steps per second to keep moving forward. For humans to do this, we'd need huge feet that we could bring up to our ears in order to create adequate "hitting."

    But fortunately there is an alternative: cornflour. By adding enough of this common thickening agent to water (and it does take a tot), you can create a "non-Newtonian" liquid that doesn't behave like normal water. Now, if the surface of the water is hit hard enough, particles(粒子) in the water group together for a moment to make the surface hard. Move quickly enough and put enough force into each step, and you really can walk across the surface of an adequately thick liquid of cornflour.

    Fun though all this may sound, it's still rather messy and better read about in theory than carried out in practice. If you must do it, then keep the water wings handy in case you start to sink and take a shower afterward!

Today's teens have grown up online. {#blank#}1{#/blank#} They study online. And surely they get their news online. But because they are so comfortable with the Internet, they seldom question news stories online. 

Now William Colglazier, a history teacher at a high school in America, is teaching his students how to think critically (批判性地) about online information and recognize a false news story.

His idea came from a study on people's online reasoning (推理) at Stanford University. {#blank#}2{#/blank#}Most middle school students in the study could not tell the difference between an advertisement and a news story, and high school and college students fully trusted the websites ending in ".org".

The good news is that, according to Colglazier, once teens realize they've been cheated, they have a strong will to tell the truth from lies. {#blank#}3{#/blank#} Some of the advice that Colglazier offers his students includes moving off the site to find more information about the site, the writer's motivations (动机) and the organization behind the news story. 

{#blank#}4{#/blank#}He hopes more kids would think critically when they read news online. "{#blank#}5{#/blank#}" he said. "If people can't tell real news from fake news, the results can be frightening."

A. They make friends online.

B. The Internet is both beautiful and ugly.

C. As students, we should recognize false news.

D. Colglazier shared some of his courses with other teens in Teen Vogue.

E. They need some advice on how to find answers and how to recognize.

F. The study found that young people have poor ability to tell truth from lies.

G. The study found students have poor ability to reason about the information on the Internet.

Making new friends can be difficult, especially if you are a child in a new neighborhood. It may seem like everyone else has a friend to sit with or to talk to. Don't worry; if you're a nice person, you can make friends too. 

Step 1. Decide what kind of people you want to play with. Choose (选择) wisely, because you'll probably become like them. Pick children that are nice to other people. 

Step 2. Smile and say something nice to the person you want to be your friend. If you like a person's shoes or think a girl is good at basketball, just say so. Everyone likes compliments. 

Step 3. Join clubs and teams. If you like sports, try out for some. Put yourself in situations where you are around many children that enjoy the same activities as you. It's easier to develop (发展) friendships when you have the same hobbies. 

Step 4. Ask questions whenever it's appropriate. People love to talk about themselves. Be careful not to ask too personal questions or ask someone too many questions. But asking one or two questions shows you're interested in him or her. 

Mobile phones have a bad influence on young Chinese students' sleep and memory，according to a recent study.

The study is based on （以……为依据） a survey of 2，298 students aged 6 to 18.It found boys are more dependent （依赖的），but girls are more likely（可能的） to use their mobile phones before they sleep than boys.（A）The more students use mobile phones before they sleep，the longer it takes for them to fall asleep.So they will not sleep well，which leads to a poor memory.

In 2021，the Ministry of Education stopped all primary and middle school students from bringing mobile phones to schools.If they want to bring mobile phones to schools，they need to hand them in to their teachers during school time.

Yu Yi，father of a primary school student in Changsha，Hunan Province，she has a smartwatch if she needs to reach us，" he added.

（B）年轻的学生很容易对手机产生依赖 ， so the intervention （干预） from parents is necessary.