GRE Reading Comprehension: Barron-GRE阅读Barron - I2KV1Q74ZM9MF1YAE$

It can be inferred from the passage that as new lithospheric material is injected from below A. the plates become immobilized in a kind of gridlock B. it is incorporated into an underwater mountain ridge C. the earth's total mass is altered D. it reverses its magnetic polarity E. the immediately adjacent plates sink