PrepTest 143, Section 2, Question 27
To glass researchers it seems somewhat strange that(470 more words not shown)
The passage suggests that which(12 more words not shown)
- AIt is higher(7 more words not shown)
- BIt has only(5 more words not shown)
- CIts upper extreme(6 more words not shown)
- DIt does not(11 more words not shown)
- EFor some types(12 more words not shown)
Reading the passage
Bring together two parts of the explanation. The transition temperature is actually a range spanning a few hundred degrees Celsius. Later, the author says glass must reach at least 350 degrees Celsius to have more than a negligible ability to flow.
What we’re looking for
That makes 350 a minimum associated with appreciable flow, not the upper limit of the whole transition. The question asks us to connect the range with that threshold rather than find a single precise freezing point.
Working the answers
- A
No comparison places medieval glass's transition range above modern glass's. The discussion of impurities and composition does not establish this specific temperature ranking.
- B
The new calculations concern how long noticeable flow would take. The author does not say the transition range has only recently been calculated precisely. A range could be measured accurately; its being a range is not itself a reason precise measurement would be impossible.
- CCorrect
The transition spans a few hundred degrees, and 350 degrees is introduced only as a minimum for more than negligible flow. Together, those statements support an upper extreme well above 350, rather than treating 350 as the endpoint or as a single melting temperature.
- D
The transition concerns a change between solid and liquid behavior, so it is relevant to the tendency to flow. D incorrectly separates the transition from the behavior it helps describe.
- E
The author describes a range, not a specific low transition temperature for some types. The requirement of at least 350 degrees for appreciable flow also gives no support for the proposed temperature well below that level.
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