31. The word “it” in the first line refers to _____.
(A) all sciences
(B) the representative theory of physics
(C) to understand what Einstein found out
(D) to describe everything in one set of equations
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統計: A(5), B(45), C(5), D(176), E(0) #1284894
統計: A(5), B(45), C(5), D(176), E(0) #1284894