最近，你班同學(xué)就“太空探索是否值得”這一話題展開了一場討論。請你根據(jù)下表提供的信息，用英語寫一篇短文介紹討論的情況。

注意：

1. 詞數(shù)：120左右；

2. 參考詞匯：短缺 shortage (n.); 太空探索space exploration

3. 文章開頭和結(jié)尾已給出

Dear David,

I’m glad to receive your letter asking me about our discussion on whether space is worth exploring. Now I’m writing to tell you our opinions.

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____________________________________________________________________________________________

____________________________________________________________________________________________

_____________________________________________________________________

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