2. We can learn from the passage that .
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
3. According to the passage,Dr. Clarke was so excited because .
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 hunt for life
D. scientists had long been looking for these caves
4. Necessary condition for life on Mars mentioned in the passage may include .
A. lava and energy
B. water and radiation from space
C. gases and lava
D. water and protection from radiation
【参考答案】1--4、CDBD
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