There is much that science still cannot explain, such as what existed before our universe began, how life ( ) arose on

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问题 There is much that science still cannot explain, such as what existed before our universe began, how life ( ) arose on earth, and much more.

选项 A、undoubtedly
B、repeatedly
C、naturally
D、conventionally

答案C

解析仍然有很多东西是科学无法解释的，比如我们的宇宙开始之前存在着什么，地球上生命的产生，等等。A选项，确实地，毋庸置疑地；B选项，反复地，再三地；C选项，自然地；D选项，照惯例。因此根据句意，答案选C项。

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