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

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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