仁爱科普版九年级上Unit 4 Amazing Scienc...

    The world's population is larger and larger. There will 1 much more people next century. The earth will be more crowded and there must be a little room 2 each person. Perhaps there will be 3 room only on the earth a few centuries later. That will be serious to humans.

    So human are 4 of a good way to solve the problems.

    The moon is the 5 that is nearest to us. Maybe man will 6 on it some day. According to the scientists, studying, we know that there is no air, no plants, no water and no life there. So scientists are doing experiments 7 many ways. They 8 solve a lot of problems 9 humans can live on the moon. I'm sure the dream must 10 in the future. Maybe it is in the next century.

A: Tina, have you heard the news on TV about Chang'e Ⅲ?

B: Yes, I have. Chinese scientists are so great that they developed it in such short time, and have succeeded in launching.

A: I know a little about it. ?

B: Certainly, Chang'e Ⅲ with a lunar probe named Yutu has reached the moon, and left Yutu on the surface of the moon.

A: ?

B: It will stay there forever, but only work for 3 months.

A: ?

B: It's used for exploring the moon and doing some scientific research.

A: ?

B: It works in the daytime and “sleeps” at night.

A: You know so much. .

B: You're welcome.

      Astronauts are not like pilots, who fly into sky. They need some special trainings. They will fly into space. First they go to the Johnson space center in Houston Texas. They are tested there. Space doctors want to know how strong and smart they are.

      First of all, their hearts are tested. The people walk or run. Next, the space doctors see how fast their hearts are beating.

      Then it is another important test. In this test the person must curl his body up in a ball. And when he is in that position, he will be put into a round cloth bag. The doctors don't tell him how long he will have to stay in the bag. If a spaceship broke down in space, the astronauts would get into bags like these. Then they would have to wait, curled up in darkness, until they are saved. You can know that an astronaut must not be afraid of tight spaces or darkness.

      After these tests, scientists only choose the best people to start astronaut training in a training center. They will learn many other things in training. They will learn how to jump out of moving airplane, to blow up a lifeboat and get into it while they are in the ocean.

They also have to learn how to get lifted out of the ocean by a helicopter.

      When they finish training, the astronauts go on to work. They stay in good situation by running and doing exercise. They read about the special jobs. In that way they will be able to learn new facts about space travel.

      Finally, the astronaut is told to go to work on a flight into space. The members begin to know each other first. Then they can learn which jobs each will do.

    In southern England there stands a circle of huge stones! Local people call it stonehenge. It's said that it was built around 5000 years ago.

    Stonehenge has about 80 stones and each is about five meters tall. They were 380 km away from where they were made. The ancient British people had only wooden tools. The stones might be moved by tree trunks. So it was a wonder to build stonehenge. Scientists say it took millions of man-hours to move and raise the huge stones.

    How did people move these huge stones from so far without machines? Nobody knows the answer. One record said the great stones were carried to England by magical aliens!

    Some scientists believe that stonehenge was a temple. Some believe it was a place to bury dead people or it was probably used for studying the stars and the sky at night. Others think it was even used to tell the time. Whatever the stones were used for, they have always been the pride of British people.

    In modern times, stonehenge has become a huge hit with tourist.