For centuries, physicists have had good reason to believe in the principle of equivalence propounded by Galileo: it has ______ many rigorous tests that ______ its accuracy to extraordinary precision.

A． In what ways do the coastlines of Africa and South America differ from one another
B． How much lighter than the substratum of igneous rock below them are the continental masses
C． Is the rotation of the globe affecting the stability of the present-day continental masses
D． According to Wegener's theory, in what direction have the Americas tended to move
E． How does Wegener's theory account for the apparent immobility of the African continent

A． support her own perception of Mary Shelley's uniqueness
B． illustrate recent changes in scholarly opinions of Shelley
C． demonstrate Praz's unfamiliarity with Shelley's Frankenstein
D． provide an example of the predominant critical view of Shelley
E． contrast Praz's statement about Shelley with Shelley's own self-appraisal