Question

　　Will Mars Become a Second Earth?

　　In the science fiction films “Total Recall” and “Red Planet”, certain scenes show the characters taking deep breaths of Martian air as though they were on Earth．

　　In both films, Mars has undergone(经历)an artificial process of “terraformation” to transform(转变)its atmosphere and environment and enable life forms to breathe its air．

　　The idea of transforming a planet such as Mars in order to make it as habitable(可居住的)as the Earth is not restricted to science fiction films and novels．It has also been proposed by some of the greatest astrophysicists(天体物理学家)and scientists of the 20th century, such as Carl Sagan．

　　Such a notion is highly idealistic, since current levels of technology and Mars' natural resistance to change would make it an extremely long process．Anyone hoping to play a Martian football match on a genuine grass pitch in the open air will probably have to wait about another 100 000 years!

问题导入：NASA(美国宇航局)is planning to make the Mars into a second earth．Is this plan practical?Some people think it a wonderful idea．But others have quite a different opinion．They believe that to make the Mars fit to live on will cost a great deal of money, time and energy．

Here comes the question．Can human make the Mars into a second earth?Debate it with your classmate in two groups．

pros：

Debater 1：In my opinion, it is practical to make the Mars into a second earth．Because lots of research finds out that there are many similar points between the earth and the Mars．And the science technology is so advanced today, I think it is practical if human devote themselves to exploring it．

Debater 2：I don't agree with him that it is not practical to make the Mars into a second earth．

Here is some evidence to show that there used to be lives on the Mars and it is possible to live there again．________________________

Debater 3：I think his evidence is some guess or prediction of some scientists that hasn't been tested．________________．

Debater 4：

In conclusion, ________ Thank you．

Cons：

Debater 1：In my opinion, it is not practical to make the Mars into a second earth．Because ________________

Debater 2：I think some of his evidence is incomplete or unilateral(片面的) _____________．

I have some evidence that it is impossible for human to live on the Mars．__________

Debater 3：I don't think your reasoning is reasonable．________________．

Debater 4：In a word, ________, Thank you．

Answer 1

答案：