Why did people in the 19th century believe the existence of intelligent life on Mars? How many arguments in this passage lead t

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问题 Why did people in the 19th century believe the existence of intelligent life on Mars?
How many arguments in this passage lead to the belief of the existence of life on Mars?

选项 A、Two.
B、Three.
C、Four.
D、Five.

答案B

解析 本段文章有三个段落,每一段讲述了一个可能的事实,来说明火星上有生命存在。本题的关键是分析文章的结构,找出每一段的主题,就很容易推断出正确选择项。
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