【正文】
Life on Mars Reading 2 Revision A: Answer the following questions about the life on Mars. 1. When will people move to the pla Mars? 2. Why will we leave our own pla Earth ? 3. How long does the spacecraft need to get to Mars at present ? 4. What might be the speed of the space shuttle by 2100 ? 5. What will the plants that can grow on Mars provide us with ? By the year 2100. Because Earth is being more and more crowded and polluted. It takes months. At half the speed of light. They will provide us with food and oxygen. 6. What will be a problem for the early settlers on Mars ? 7. How can people prevent this problem ? 8. What are the advantages for people on Mars ? 9. What can the students do in online schools ? 10. Where should the students connect their puters ? Gravity. Humans will have to wear special boots to make themselves heavier. a. More space b. More time c. No school. They can study , do their homework and take exams. They should connect their puters to an interplaary work. Revision B: Fill in the blanks with proper words. Our own pla , earth , is being more and more ________ and _________. Hopefully, we can build a better world on _______ by the year 2100. First , _________ should be better . At present , it will take the spacecraft months to carry large _________ of people to Mars. By 2100, the __________could take only a few hours in space shuttles that travel at half the speed of light. Gravity will be a problem for the early _________ on Mars. The gravity on Mars is only about______________ of the gravity on Earth . That would be