4. 短文开头explorers与moon people之间的对话中即已点明use inner space,也就是build down这一主题;结尾段中则更为明确地将全文主题(underground development)解释为building down rather than building up is a good way to use the earths space,,由此可以确定本题答案为D。
文章来源:慧师网
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