【正文】 waiting at the airport. He was going to take them and their baggage to catch “The True North”, the cross Canada train. On the way to the statiion, he chatted about their trip. “You’re going to see some great scenery. Going eastward, you’ll 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, but they forget the fact that Canada is 5500 kilometers from coast to coast. Here in Vancouver, you’re in Canada’s warmest part. People say it is Canada’s most beautiful city, surrounded by mountains and the Pacific Ocean. Skiing in the Rocky Mountains and sailing in the harbour make Vancouver one of Canada’s 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 so wet there that the trees are extremely tall, some measuring over 90 metres.”The 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 to 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 puter stopped working. What was happening? I tried to turn the spaceship away from the hole but it would not move. Would it eat us too?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. As the rocket rose into the air, we were pushed back into our seats because we were trying to escape the pull of the earth’s 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 the 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 as the earth’s. “ I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earth bee 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 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 dear,” 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.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 the 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.Unit 5That afternoon aboard the train, the cousins settled down in their seats. Earlier that day, when they crossed the Rocky Mountains, they managed to catch sight of some mountain goats and even a grizzly bear and an eagle. Their next stop was Calgary, which is famous for the Calgary Stampede. Cowboys from all over the world e to pete in the Stampede. Many of them have a gift for riding wild horses and can win thousands of dollars in prizes.“The True North” from Toronto to MontrealThey met Lin Fei around dusk in downtown Chinatown, one of the three in Toronto. Over dinner at a restaurant called The Pink Pearl, the cousins chatted with Lin Fei, who had moved to Canada many years earlier. “We can get good Cantonese food here,” Lin Feitold them, “ because most of the Chinese people here e from South China, especially Hong Kong. It’s too bad you can’t go as far as Ottawa, Canada’s capital. It’s approximately four hundred kilometers northeast of Toronto, so it would take too long.”s too bad,” he said. “Montreal is a city with wonderful restaurants and clubs. Most of us speak both English and French, but the city has French culture and traditions. We love good coffee, good bread and good music.”Leaving the moon’s gravity was not as painful as leaving the earth’s. But returning to the earth was very frightening. We watched, amazed as fire broke out on the outside of the spaceship as the earth’s 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,” he smiled, “ which star would you like to go to?”But then the spaceship jumped again. This time it moved sideways and away from this edge of the “black hole”. Someone watching 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 puter had started working again. We realized that we had discovered something new about “black hole”. If you go inside the edge of a “black hole”, it will “eat” you and there is no escape。A trip on “ The True North”After two days’ travel, the girls began to realize that Canada is quite empty. At school, they had learned that most Canadians live within a few hundred kilometres of the USA border, and Canada’s population is only slightly over thirty million, but now they wer