If you want to study the nature of the universe, first of all, you must be clear

题干

If you want to study the nature of the universe, first of all, you must be clear about its ________.

A．traditions

B．consequences

C．signs

D．origins

上一题下一题 0.64难度单项选择更新时间:2013-04-20 11:45:59

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