Monica Grady, a planetary scientist at the Natural History Museum, London, shares this view. “We cannot risk starting a global experiment that would wipe out the precious information we are looking for,” she said. “This is just wrong”.

41. A plan for changing the present state of Mars_________.

A. has been made                                 B. will be put into practice

C. has been given up                               D. is being argued about

42. According to the passage, besides scientists, __     ___are also interested in the future of Mars.
 

A. the public                                     B. science fiction writers

C. the governments of many countries                 D. news reporters

43. The signs of methane in the Martian atmosphere greatly support the view that ___    ____

on Mars.

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