Big schoolbags have been a serious problem for students for a long time. Maybe your schoolbag is too1to carry, and it troubles you a lot2you want to find a book out to read. Now an e textbook will3you.

    It is said that e textbooks are going to be4in Chinese middle schools. An e textbook, in fact，is a small5for students. It is much6than a usual schoolbag and easy to carry. Though it is as small as a book, it can7all the materials(材料) for study. The students can read the text page by page on the8 ， take notes with the pointer (屏写笔). Or even"9" their homework to their teachers by sending e mails. All they have to do is to press a button.

    Some people say e textbooks are good, but some say they may be10for the students eyes. What do you think of it?

    Today, roller skating (滑旱冰) is easy and fun. But many years ago, it wasn't easy at all. Before 1743, people never tried skating on wheels. That changed because of a man named John Joseph Merlin. Merlin's work was making instruments. In his free time he liked to play the violin. Merlin was a man with many ideas and many dreams. People called him a dreamer.

    One day Merlin received an invitation to go to an important party. He was very pleased and a little excited. As the day of the party came near, Merlin began to think. He wanted to find a way to make a wonderful entrance at the party. Merlin had an idea. He thought that he would attract a lot of attention if he could skate into the room.

    Merlin tried different ways to make himself roll. Finally, he decided to put two wheels under each shoe. These were the first roller skate shoes. Merlin was very proud of them. He dreamed of arriving at the party and skating into the room while playing the violin. He was sure that everyone would be very surprised.

    On the night of the party Merlin rolled into the room, playing his violin. Everyone was really surprised to see him. There was just one problem. Merlin had no way to stop his roller skating. He rolled on, playing the violin. Then, with all eyes on him, Merlin hit into a huge mirror on the wall. The mirror broke into many pieces with a very loud noise. But nobody forgot Merlin's wonderful entrance after that.

The weather is getting hotter and hotter. You are thirsty playing basketball or riding home from school. A cold drink may be just the thing. But be careful what you are drinking. Something that looks cool may not be good for your health.

There are plenty of "energy drinks" advertisement on TV. Most of them have beautiful colors and cool names. They tell you they are helpful to your health. Sounds great and lots of people believe them!

But after a careful check you may find that most energy drinks have lots of caffeine (咖啡因) in them. These drinks are especially aimed at young people, students, busy people and sports players. Makers sometimes say their drinks make you better at sports and can keep you awake. But he careful not to drink too much.

Caffeine makes your heart beat fast. Because of this, the International Olympic Committee has limited (限制) its use. Caffeine in most energy drinks is as strong as that in a cup of coffee or tea. Possible health dangers have something to do with energy drinks. Just one box of energy drink can make you nervous, have difficulty sleeping and can even cause heart problems. Scientists say that teenagers should be discouraged from taking drinks with a lot of caffeine in them.