【題目】Neil Armstrong is the first man to walk on the Moon. It was brave of him to go to a place that was (know) to people at that time.

【答案】unknown
【解析】句意：句意：尼爾·阿姆斯特朗是第一位在月球上步行的人。他那時去一個不為人知的地方很勇敢。在第一次登月之前，月球對人類很陌生，人們對它不知道，故填：unknown。

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