A.How the caves were formed on Mars. |
B.How NASA sent the pictures back to earth |
C.Caves on Mars may be full of hot air or a sign(跡象)of life. |
D.Scientists have completely recognized the surface of Mars. |
A.water has already been found on Mars |
B.the scientists found all the caves at night |
C.it is certain that there is life in these caves |
D.the surface of Mars is bitterly cold, radiation-soaked and dry |
A.such caves could provide energy for life |
B.they had finally found the caves on Mars |
C.such caves would be perfect places to search for life |
D.There would be life on Mars. |
A.lava and energy | B.water and radiation from space |
C.gases and lava | D.water and protection from radiation |
A.the Mars | B.the earth | C.the caves | D.radiation |
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