What does the author see as the function of the universe's unseen "switches"?
A.They tell us which one of the tracks the universe will use.
B.They enable us to alter the course of t he universe.
C.They give us information about the lunar surface.
D.They determine which course the universe will take in the future.
第9题
下列不属于人体必须摄入微量元素的是
A.铁、锌、镁
B.钙、镁、硫
C.铜、铁、碘
D.钙、磷、锰
E.钼、硒、硅
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