The cost of building a space elevator is only a {#1} of building a rocket.<br>The cost of building a space elevator is only a 1 of building a rocket.(analysis)<br>

The cost of building a space elevator is only a {#1} of building a rocket.
The cost of building a space elevator is only a 1 of building a rocket.(analysis)

出自：2024年国家开放大学答案

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