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1、a chance to make a trip into space with my friend Li Yanping, an astronomer. We visited the moon in our spaceship!Before we leave, Li Yanping explained to me that the forece of the gravity would change three times on our journey and that the first change would be the most powerful. Then we were off.
2、 As the rocket rose into the air, we were pushed back into our seats because we were trying to escape the pull of the earths gravity. It was so hard that we could not say anything to each other. Gradually the weight lessened and I was able to talk to him. “ Why is the spaceship not falling back to t
3、he earth? On the earth if I fall from a tree I will fall to ground.” I asked. “ We are too far from the earth now to feel its pull, “ he explained, “ so we feel as if there is no gravity at all. When we get closer to the moon, we shall feel its gravity pulling us, but it will not be as strong a pull
4、 as the earths. “ I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earth become smaller and the moon larger.When we got there, I wanted to explore immediately. “ Come on,” I said. “ If you are right, my mass will be less than on the earth because the moon
5、is smaller and I will be able to move more freely. I might even grow taller if I stay here long enough. I shall certainly weigh less!” I laughed and climbed down the steps from the spaceship. But when I tried to step forward, I found I was carried twice as far as on the earth and fell over. “ Oh dea
6、r,” I cried, “ walking does need a bit of practice now that gravity has changed.” After a while I got the hang of it and we began to enjoy ourselves.Leaving the moons gravity was not as painful as leaving the earths. But returning to the earth was very frightening. We watched, amazed as fire broke o
7、ut on the outside of the spaceship as the earths gravity increased. Again we were pushed back hard into our seats as we came back to land. “ That was very exhausting but very exciting too,” I said. “Now I know much more about gravity! Do you think we could bisit some stars next time?” “Of course,” h
8、e smiled, “ which star would you like to go to?”Caught by a black holeThe spaceship warned Li Yanping and me to be ready as we were approaching the “black hole”. We could see some faint lights around what looked like an empty space. Li Yanping said, “ That empty hole is like a mouth always needing t
9、o be fed. Those lights are thins that are being pulled into time by the gravity of the hole.” We watched with interest and amazement at the lights which seemed to be going fainter and fainter round the edge of the black hole. Just then the lights on our spaceship went our the and the computer stoppe
10、d working. What was happening? I tried to turn the spaceship away from the hole but it would not move. Would it eat us too?Suddenly the spaceship jumped and began to move round the edge of trhe hole too. The gravity of the “black hole” was pulling us into its “mouth”. As the spaceship moved round th
11、e black hole, I felt rather sick. My mouth went dry and I closed my eyes. All the stories about what happened when you were caught by the gravity of a “black hole” seem to be true.But then the spaceship jumped again. This time it moved sideways and away from this edge of the “black hole”. Someone wa
12、tching me would have seen the spaceship flying like a bird away from the “black hole”. But we felt nothing. At last we were able to look around us. Luckily the computer had started working again. We realized that we had discovered something new about “black hole”. If you go inside the edge of a “bla
13、ck hole”, it will “eat” you and there is no escape; but if you do not, you may have an opportunity to escape. How exciting!Unit 5A trip on “ The True North”Li Daiyu and her cousin Liu Qian were on a trip to Canada to bisit their cousins in Montreal on the Atlantic coast. Rather than take the aeropla
14、ne all the way, they decided to fly to Vancouver and then take the train west to east across Canada. The though that they could cross the whole continent was exciting.Their friend, Danny Lin, was waiting at the airport. He was going to take them and their baggage to catch “The True North”, the cross
15、 Canada train. On the way to the statiion, he chatted about their trip. “Youre going to see some great scenery. Going eastward, youll pass mountains and thousands of lakes and forests, as well as wide rivers and large cities. Some people have the idea that you can cross Canda in less than fice days,
16、 but they forget the fact that Canada is 5500 kilometers from coast to coast. Here in Vancouver, youre in Canadas warmest part. People say it is Canadas most beautiful city, surrounded by mountains and the Pacific Ocean. Skiing in the Rocky Mountains and sailing in the harbour make Vancouver one of Canadas most popular cities to live in. Its population is increasing rapidly. The coast north of Vancouver has some of the oldest and most beautiful forests in the world. It is
