Unit1 Life on MarsEnvironmental protectionl. 污染是当今世界最严峻的问题之一；很多地方，垃圾被扔进了湖泊和河流；因此，很多湖泊和河流都遭受了污染； 2. 有些城市，空气中都充满了污染；这导致人们生病；和人类一样，动物们也深受其害； 3. 如果我们不行动起来保护环境，将会有更多的生物死于污染。 The population on the earth is getting larger and larger. And the earth is becoming more and more crowded and polluted. We can build a better world on another planet. MarsPart B11. crowded 2. rapid3. population4. all over again5. passenger6. tasty7. specially8. comparea for one purposeb a second time from the beginningc decide in what way things are similar or differentd having a nice tastee full of peoplef happening in a short period of timeg a person who rides in a car, bus, train, ect. but does not drive ith the total number of people in an area, a country, ect.efhbgdacRead the passage quickly to find out the answer:Will life on Mars be better than that on Earth?In some ways it is.The main idea of each paragraph:Para. 1 homePara. 2 gravityPara. 3 schoolPara. 4 transportPara. 5 water,oxygen and foodPara. 6 problems on Earth1.Why do we need to move to Mars ?2.When can we live on Mars?Because the earth is becoming more and more crowded and polluted . By the year 2100.Para.1 Problems on EarthAt present spacecraft are too ______ and it takes __________ to fly to Mars.By the year 2100, spacecraft travel at ________________ and it might take about _______________ to get to Mars. But the journey might be quite _______________. Many people would feel _____.Para. 2 Transportslowmonthsthe speed of light 20 minutesuncomfortableill( )1. Humans need water,oxygen and food to survive.( )2. There’s enough water and oxygen for people on Mars.( )3. Pla...
