单项选择题

案例分析题 Which is the best title for this passage

A．The Possibility of Life on the Mars
B．Future Conditions on the Mars
C．The Mars and the Earth
D．A Study of the Climate of the Mars
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单项选择题
The author's attitude towards the possibility of life on the Mars in the future is
A．doubtful
B．positive
C．negative
D．uninterested
单项选择题
People may be able to live on the Mars ______.
A．within the next 200,000 years
B．only 200,000 years from now
C．only 150,000 years from now
D．as soon as the planet becomes cool enough
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