Which of the following may be the reason for humanity’s exploring? As for the issue of whether life ever existed on Mars, the a

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问题 Which of the following may be the reason for humanity’s exploring?
As for the issue of whether life ever existed on Mars, the author seems to be ______.

选项 A、confirmative
B、doubtful
C、suspicious
D、cautious

答案D

解析 本题是主旨题,参见文章第2段,其大意是:有关火星在科研上的益处的呼声大概比以往任何时候都要高。这颗行星上是否曾有过生物,这种生物是否还存在?这一问题已受到人们的高度关注。…无论是过去还是现在,有关火星上存在着生物这一肯定答案都会为研究人员提供有关生命的条件范围的极有价值的数据。可见作者既没有肯定又没有否定,持很谨慎的态度。
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