Miss Kate taught physics in a New York school. Last month she was explaining to one of her classes about sound, and she decided to test them to see how well they had understood her explanation. She said to them, "Now, I have a brother in Los Angeles. If I was calling him on the phone, and at the same time you were 80 meters away, and were listening to me from across the street, which of you would hear what I said earlier, my brother or you and for what reason?"

A boy at once answered, " Your brother, Miss Kate, because electricity travels faster than sound waves(声波).

"That's very good." Miss Kate said, but then Jenny said, "I don't agree. Your brother would hear you earlier because it is 11 o'clock here, it's only eight o'clock in Los Angeles."

根据短文内容回答下列问题。

    Camping in your backyard is full of fun, whatever your age is. It's great for keeping us relaxed. It offers chances to check the night sky and to be noisier than usual. It lets us have friends over to stay who might not fit inside the house! Follow these instructions and you'll have a night you'll never forget!

    Put up your tent.

    Depending on the number of family members and guests, you may need more than one tent. Tell your friends to bring their tents if needed. Follow the instructions or check out the articles on how to put up a tent on the Internet.

    Prepare your bedding.

    You'll want your guests to be able to relax in comfort. Put something soft to lie on on the floor: A blow-up air mattress or thick comforters may work well. Fill the tent with soft toys and blankets(毯子). Have lightweight sleeping bags or cotton blankets. They are especially important if you live where the night temperatures drop greatly.

    Prepare a seating area.

    If you have a picnic table, that would work best. If not, set up a few chairs and a small table to set out drinks and food. A simple choice is to lay out a blanket in the sun, so that your friends can eat and talk. Be sure the grass isn't wet!

    Make memories.

    Plan some activities. You're camping in the backyard, so it's time to make the most of being outdoors.

    Have a camera nearby to take silly photos of you, your family members, and your friends. Take one large group shot with everyone smiling and laughing. Be sure to make copies for everyone!

    What do you eat every day? Some people think about it. And some people will not make plans for their meals.

    Many people like to have fast food near their offices. This kind of food can make them fat and it is bad for their health. Even it will make them ill when they are old.

   What should a healthy person eat every day? Well, I will tell you the 'healthy eating habit(习惯)'. It comes from doctors.

     When people do a lot of work, the energy is burning(燃烧). So you need noodles, rice, milk, bread and eggs. If you don't eat them, you will feel tired. You should eat fruits and vegetables, too. There are a lot of vitamins（维生素） in them. They can make you strong. And they can give you water.

    Summer is a great time to get a new hobby. It's something that can start now and last all through the year. If you like music, think about some music lessons such as guitar or drum. You may think about joining in the music team for teens. You can also make some new friends there. Do you collect your favorite things? Now it's the time. There are many fun things to collect like postcards, especially sports cards. If you enjoy taking photos, you can choose the photography classes. And don't forget to share your wonderful pictures with your family members and friends. How about cooking? Try to read some books about cooking. Maybe you can cook with your morn. That will be great fun. If you are bored (无聊的) at home, bike-riding is also a hobby. Why not go bike-riding? You can get exercise as well as enjoy the beauty of nature. Maybe you have a nice summer.

Information Card

    Mo Ya, Nobel Prize winner in literature (文学)in 2012, believes his success comes from a large amount of reading.

    Mo was born into a farming family in a village in Shandong Province. Mo left school at the age of 12 and started to work in the fields. Mo was tired after his daily hard work, but he was always hungry for books. However, there were very few books in the village, he never gave up. He read his elder brother's textbooks and even dictionaries.  He helped others with farm work in exchange for books.

    After Mo left his hometown and joined the army in 1976, he began to read widely, including works by Lu Xun and many other famous writers. He studied from these writers but did not copy them.  Instead, he developed his own style.

    Making the most of time is important in our life. Here are some tips that might be of help to you.

    Make a plan. You should make a list of what you want to finish every week. The plan includes things you want to finish. You should know what the most important ones are, and try your best to do them first.

    Control your stress. No matter what kind of stress you have, try to keep cool. When you have a lot of things to do, too much stress may make you slow. Don't work all day without breaks.

    Focus on one thing at a time. Don't try to do many things at a time! You will lose your focus (注意力), and it will take you longer to finish your work.

    Just say "no". If you really don't have the time to help out, just say "no". You're only one person, and you can't save the world by yourself!

    Stop wasting time on the phone. While talking on the phone, keep your conversations short. In this way, you'll waste much less time.

    Relax. The most important thing is to take time to relax. Even if it's a 10-minute walk, get away from your work and get relaxed.