Everyone  1  that milk is white and that milk is important for children's growth and a healthy  2  for the adults.

    But now many European young people believe that it is not quite helpful to someone if he still  3  white milk, a children's favorite drink. So they  4  white milk at a certain age.

    In Switzerland, 5  , a new kind of milk has been  6  . It is no longer  7  . Will you believe that the “milk”  8  is brown is made from ordinary milk?

    That invention has  9  people's mind about milk. Now in Swiss restaurants people always ask for such a drink because it has no  10  of milk, although it still keeps the nutritious elements(营养成分).

    The world 1 many interesting sounds. Some are unpleasant to our ears while 2 are very pleasant to hear. In single day you probably hear 3 sounds. All sounds are different. Some 4 loud, some sounds are high, others are low, some sounds are useful.

    5 sound we can't talk or listen to each other. The ringing of the alarm clock wakes people up. The hooting（鸣笛声）of a car warns people of danger.

    Some sounds are harmful. When planes fly low 6 the land; the very loud sounds can damage the house. Very loud sound can even make people deaf.

    We know sound travels about one kilometer in three 7. In a thunder（雷）storm you see the lighting first and then hear the thunder. This is because light travels 8 than sound.

    Next time you see lighting count the number of seconds before you hear the thunder.

    Divide（分成）this number 9 3. This will tell you 10 kilometers away the thunder storm is.

    How much do you know about the universe? In the huge universe, there is the Galaxy and many other galaxies. In the Galaxy, there is the Solar System and lots of other stars. In the Solar System, there is the sun, the earth and seven other planets. As we know, the eight planets go around their star —the sun. In our Earth—moon System, the moon goes around the earth. And because our earth keeps turning around the sun all the time, we have day and night. When our part of the earth turns to the sun, it is day. When our part of the earth turns away from the sun, it is night.

    Just because the moon is closer to the earth than the sun, it looks much bigger than the sun. The sun is big enough to give out very strong light. The moon itself can't give any light at all, but it looks quite bright, too. In fact, the light from the moon comes from the sun. Although, the moon looks much bigger and brighter than the sun and other stars, in fact, all the stars are much bigger and brighter than the moon. They look smaller than the moon also because they are farther away from us. It's clear that big things will look smaller when they are farther, and small things look bigger when they are nearer.

So far, we have traveled to many other planets in the universe. But scientists haven't discovered any living things on any other planets. Scientists haven't discovered any other planets with a good environment. They aren't sure if there is any water and air for living things to live on other planets. People always ask the question: Is there anyone out space? Our scientists haven't got a clear answer either. Some people think it will be a secret for a long time. But we believe we can solve the problem some day.

Exploring our Solar System and the universe is a great national project to some countries. Our Chinese scientists are also trying to send spaceships with astronauts to those planets and even the universe. At 9:00 a.m. on October 15th, 2003, a Chinese astronaut called Yang Liwei was sent up to space. He stayed there for hours and got back to the earth at 6:00 a.m. the next day. It was the first time for Chinese to have a space travel.

    How could we live without the Internet? That's1most of us keep in touch with friends, find cool places to visit, or get the latest2. We can use it to do homework, find out what new movies are on, get information3a college (大学) we're thinking about, or find a job. Almost(几乎)4we can think of has a website about it.

    5you've heard stories about people who are cheated(被骗) in chat rooms. Some users don't tell others their true names. Everyone in the chat room looks like6a mask(面具). Some people may want to do something7in it. They will sometimes ask visitors for their information. The information might be about their families, or where they8. It shouldn't be given away. This might9you or your family.

    Of course, the Internet is home to millions of places you can and should visit. However, remember to10yourself while online.

    My name is Miranda Gibson. I have been at the top of a tree for five months now. Some people might wonder 1 on earth I would choose to do that.

    I have walked 2 this forest many times. On 12 December 2016, machinery (大型机械) rolled into the forest and the destruction (摧毁) began. I couldn't bear (忍受) the thought that these forests would be 3 forever. So, on 14 December 2016, I put my clothes into a bag, 4 my job plans, and climbed 60 meters to the top of this tree. I have been there ever since.

    Life in the tree tops can be challenging. I have times when I feel frustrated (沮丧的) and I wish I could 5 to have a holiday for a few days! There are times too, when I feel terribly 6. I miss my friends and family.

    Living on the tree has been exciting and encouraging. I am willing to 7 up here for a long time, 8 I honestly hope it won't be too 9 before I can put my feet on the ground below and stand in a forest that will never 10.