单选题
Why did people in the 19th century believe the existence of intelligent life on Mars?
A、
Because the surface of Mars seemed to be geometric.
B、
Because the lines were drawn across the surface of the planet.
C、
Because a system of canals was thought to be there.
D、
Because it was the Martians that built the canals.
【正确答案】
C
【答案解析】
[注释] 本题的依据句在文章的第一段。A选项的意思不完整，没有包含关键信息；B选项的意思错误，不符合短文的含义；D选项的意思由本段最后一句话所否定，属于错误说法。
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