In addition, two different groups of scientistsannounced on March 28 that they had found signs of methane (甲烷) in the Martian atmosphere (大气)．The gas is a waste product of living creatures and could be produced by microbes (微生物) living in the red planet's soil.

　　But scientists such as Dr Lisa Pratt, a biologist at Indiana University, say that these microbes will be put in danger by the little earth project.“Before we have even discovered if there is life on Mars, we are talking about carrying out projects that would destroy all these native life forms, all the strange microbes that we hope to find buried in the soil，” said Dr Pratt.This view is shared by Monica Grady, a planetary scientist at the Natural History Museum, London.“We cannot risk starting a global experiment that would wipe out the precious information we are looking for.” she said, “This is just wrong.”

　　20．The passage is about________.

　　A．a plan turning Mars into a little earth

　　B．the necessity of changing Mars

　　C．Mars supporting life

　　D．finding water in the Mars

　　21．We can infer from the passage that________.

　　A．water is a crucial factor for life

　　B．the project will have little effect on the native life forms supposed to live on the Mars

　　C．Monica Grady is in favour of carrying out the little earth project

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