14．He traveled in the space for twenty-one and a half hours．

分析 他在太空旅行了二十一個(gè)半小時(shí)．

解答 答案：去掉space之前的the
本句中的space指的是太空，故它的前面不加任何冠詞．

點(diǎn)評(píng) 做本題時(shí)，需要掌握名詞space的用法；當(dāng)space意為"太空"時(shí)，其前不加冠詞；當(dāng)space意為"場(chǎng)所、空地、時(shí)間"等，指"在某一場(chǎng)所或在某一時(shí)間內(nèi)"時(shí)，它的前面可以加冠詞；如：in the short space of human life 在短暫的人生中．

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