Travelling is a very good activity. When you get tired of your work or study, and when you have free time, you can go to a beautiful place to enjoy the beauty(美丽) of nature(大自然) or other cities. You can take in fresh air, meet different people and make friends with them. It's good for your health to do so.

    But sometimes, travelling is not an enjoyable thing. For example, the weather can be changeable. There may be rain when you travel. You may catch a cold or be ill while travelling. The worst(最糟糕的) thing is that the thieves may steal(偷) your money. All these may happen to a traveler.

When you go on a trip, you must get everything ready. Firstly, you must have clear information about the weather. Secondly, ask a friend to go with you so that you can help each other. Thirdly, you must be careful everywhere and try not to cause accidents（引起事故）. If you do these, you will enjoy your travel.

    It's Wednesday afternoon. School is over. The students are putting their books, pencil-boxes into their school bags. The teacher comes in and says to the students, "Don't go, children. ⑴我有事情要告诉你们. Listen to me. Tomorrow is Thursday. ⑵明天早上九点我们学校有一个家长会(parents meeting). ⑶Here are your school reports and letters to your parents. Take them home. Give your parents letters and show them your school reports. ⑷Ask them to come to the meeting.  If your parents are working in the other place now, let your aunt or uncle come, please. Because I'm going to say something about next term. ⑸Ask them to come on time. "

    There are 22 classes in Mary's school. There are thirty five students in each class, but there are thirty four students in her class. There are twenty boys and fourteen girls. Her classroom is on the third floor(楼层). There's a computer and a television in her classroom. The computer is on the teacher's desk. There aren't any pictures in the classroom. The classroom is big and clean.

    The ENIAC (电子数学积分计算机) was the first modern computer. It was built in 1946 at the University of Pennsylvania (宾夕法尼亚洲). The machine was very big. It was the size of a large room. It was also very heavy. The ENIAC weighed more than 27,000 kilograms. It was very expensive. Plus, it was not easy to use. But it did a good job.

    Over the years, computers got smaller and smaller. They also got cheaper and cheaper. First, big businesses got computers. Then, small businesses bought them. Now, people have computers at school, work, and home. Our small computers are much faster than the ENIAC.

    Nobody uses the ENIAC now. But we still remember it. It is important in the history of computers.

    Raising chickens seems a difficult task for teenagers. Grace Goodpasture from Virginia, US, not only raises them but also tries to breed（喂养） the "perfect chicken". And she even won an award for her love of science.

    Grace started breeding chickens in her third grade at Steward school. At first, she worked on some farms for her school project. But later the fourteen-year-old started to have some ideas of her own.

    "Some have thicker eggshells(蛋壳), and they are hearty(健壮的) throughout the winter," said Grace.

    Since then, the young science lover started to try to find the healthiest free-range(散养) chickens. And she ended up breeding a type that now bears her name.

    The National Science Teachers Association (NSTA) gave the 2015 Angela Award to Grace Goodpasture. Her interests don't end with chickens and eggs. She is also into building robots and testing preservatives (防腐剂) in fast foods. In her words, she wants to go to Virginia Tech for poultry (家禽) sciences in the future.