GRE Reading Comprehension: ETS-GRE阅读ETS - E7J3YXSP50337Q447

It can be inferred from the passage that, theoretically, molten nonmetallic glasses assume a crystalline structure rather than an amorphous structure only if they are cooled A. very evenly, regardless of the rate B. rapidly, followed by gentle heating C. extremely slowly D. to room temperature E. to extremely low temperatures