亚利桑那州立大学行星地质学家Ronal Greeley说: 如果你的资源有限,你只能在你现有知识的基础上做出探索。 这好比你在夜里回家的路上丢失了钥匙:你先找的地方是有街灯的地方,不是因为钥匙更可能在那里,而是因为如果要是真在那里,你就能看到。对于天体生物学家来说,水的光谱线的作用就如街灯,显示了火星、木卫二,甚里海卫一上有生命的可能。但是在金星高温的岩石表面却没有找到水的光谱。
测试题
1. Venus is the hottest of all the nine planets in the solar system because_____________.
A) it is not so close to the sun as Mercury
B) many volcanoes spread the whole planet
C) it is covered by a thick layer of cloud
D) greenhouse effect is uncontrollable on it
2. Some planetologists believed there had never been lives on Venus because____________.
A) they couldnt find any trace of water on it
B) they found Venus is too hot for any Jives
C) Venus is covered by dirty and poisonous cloud
D) Venus is the second nearest planet to the sun
3. It can be inferred from the passage that the small group of advanced lifeforms on Earth believed that_____________.
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