2. 外语
  3. We still know little about outer ______ though we have made much effort in research.

We still know little about outer ______ though we have made much effort in research.

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问题 We still know little about outer ______ though we have made much effort in research.
选项 A、heaven
B、universe
C、space
D、sky
答案C
解析 本题考核名辨析使用。选项意为：heaven当不可数名词时，意为“天国，天堂”；用作复数时，意为“苍穹，天空”；universe指包括太空以及太空内所有物体的“宇宙，万物”，如：God made the universe．上帝创造万物。space指地球大气以外、其他天体运行的地方，意为“太空”；sky意为“天空”，指地球上面的大气，如：The sky turned dark as the storm came near．暴风雨来临时，天空转暗。根据题意：尽管我们努力进行研究，但对外部空间仍然知之甚少。C是答
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大学英语四级

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