Why did people in the 19th century believe the existence of intelligent life on Mars? The "canals" on Mars have proved to be __

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问题 Why did people in the 19th century believe the existence of intelligent life on Mars?
The "canals" on Mars have proved to be ______ according to the passage.

选项 A、the minor geologic characteristic of Mars
B、natural valleys on the surface of Mars
C、rivers that have kept flowing since ancient times
D、a system that irrigates the whole surface

答案B

解析 本题的依据句是第一段最后一句话,关键词语是natural valleys。A选项的意思没有出现在依据句中,属于无关信息;C选项的后半句话与事实不符合,原文中说的是古代的河流,不是一直到现在还在流水;D选项the whole surface意思过于绝对。
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