What is the main idea about the passage? Generally speaking how many stages are there in a multistage rocket?

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问题 What is the main idea about the passage?
Generally speaking how many stages are there in a multistage rocket?

选项 A、Two.
B、Three.
C、Four.
D、Five.

答案C

解析表面上看应该选B。但仔细分析一下，发现第四段又将火箭分成二级，所以应该选C项。

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大学英语三级A级

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