Which of the following may be the reason for humanity’s exploring? The aerial photographs taken last year indicate that ______.

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问题 Which of the following may be the reason for humanity’s exploring?
The aerial photographs taken last year indicate that ______.

选项 A、there did exist liquid water on Mars
B、a drainage channel was cut deeply by Martians
C、there isn’t any life on Mars
D、water had flew on Mars for hundreds to thousands of years

答案A

解析 本题是细节题,参见文章第3段末,其大意是:有关火星表面上的液态水曾一度很稳定的论点由于去年空中拍摄的照片而更有说服力。这些照片展示出一条好似水流冲击而成的排水渠道,如果没有数千年也有数百年了。由此可判断火星上曾经确实存在过液态水。
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