PrepTest 143, Section 2, Question 22
To glass researchers it seems somewhat strange that(470 more words not shown)
The passage most helps to(7 more words not shown)
- AWhat is one(15 more words not shown)
- BWhat is one(13 more words not shown)
- CWas glass ever(7 more words not shown)
- DAre unevenly thick(8 more words not shown)
- EHow did there(8 more words not shown)
Reading the passage
The final paragraph gives us a sequence of manufacturing methods: blowing and whirling a disk, later drawing sheets from molten glass with a rod, and today's floating process on molten tin. We can answer a question about those changes. Other details, such as the source of impurities, are mentioned without an explanation of their history.
Working the answers
- A
The account says the blowing-and-flattening method was the only way to make window glass until the nineteenth century. It does not identify a seventeenth-century method that differed from medieval production. The problem is the missing contrast, not merely the absence of the words seventeenth century.
- BCorrect
The manufacturing sequence supplies the requested contrast with today's method. Glass was drawn into sheets by pulling it from the melt on a rod; most window glass today is made by floating liquid glass on molten tin. Those are different production techniques, and the final paragraph explains their place in the progression toward uniform panes.
- C
We are not told when glass was first used in windows or whether that use preceded medieval times.
- D
Germanium oxide glass is discussed as a relatively easy-flowing material. The author does not say whether it was used in uneven stained-glass windowpanes. Mentioning both does not establish that connection.
- E
The author discusses what impurities could do to viscosity, not how those impurities entered medieval glass.
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