题目内容
Is there life on Mars? We still do not know.According to scientific data,we are s1 that people cannot live on Mars. People need much oxygen to breathe,but there is almost no oxygen on Mars.
Living on Mars would be 1 2 living on a very high mountain.There would be little air. It might be 50℃ a 3 zero at noon and 100T!below zero at night.
Many people u 4 to think there could be plants on Mars.We now know that Mars has very little carbon. Carbon is a kind of material found in all p 5 and animals on the Earth.
Through a telescope,Mars 16 red.In some places,it seems grey.At times,the grey colour t 7 grey-green,then brown,and then grey again. People once thought this suggested that plant life changed c 8 with seasons.
Today we know that the red colour c 9 from a fine dust of iron on the planet. Scientists are still working to e 10 the changing colours.Will man go to Mars one day? If they do,they will have to take along their own oxygen,food,clothes,and something to sleep in.
1. 2. 3. 4. 5.
6. 7. 8. 9. 10.
1. sure 2. like 3. above 4. used 5. plants 6. looks 7. turns
8. colour 9. comes 10. explain
