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passage 4
P1
To glass researchers it seems somewhat strange that many people throughout the world share the persistent belief that window glass flows slowly downward like a very viscous liquid. ████████ ██ █████████ ██████ ██ ███████ ████████ ███ ██████████ ███ ████ ███ █████ ████ ███████ ██ ███████ ██████ ███████ ██ ███ ███████ ███
Common belief ·
Glass flows downward like a liquid
Origin of false belief ·
People misunderstand the fact that glass atoms aren't in a fixed structure
Because the atoms aren't fixed, people think that glass is like a liquid. By using "myth," the author indicates the common belief is false.
Features of glass ·
Transition temperature
Cooled below the transition temperature, glass has physical properties of solid, even though it has non-fixed structure.
P2
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Debunking hypothesis about windows ·
People think stained glass windows are thicker at the bottom than the top because glass flows downward
Even though glass does very slightly flow downward, research shows this belief about stained glass windows is wrong.
Study debunking hypothesis ·
Zanotto's research
It would take too long for the thicker bottoms of windows to result from glass flowing downward.
P3
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Elaborating on study ·
Although composition of windows can make glass flow faster, still not fast enough
P4
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Author's hypothesis ·
Thicker bottoms of glass are due to manufacturing methods
Support for hypothesis ·
In 19th century, had to make glass in way that thickened the edges
People probably put thicker edges toward bottom for structural stability.
Passage Style
Critique or debate
Phenomenon-hypothesis
21.
Which one of the following ████ ██████████ ██████ ███ ████ █████ ██ ███ ████████
a
Zanotto's research has ██████ ████ ███ ██████ ██ ████ ████████ ███ ███████ ████ ██ ██████ ███ █████████ ██ ████████ █████████ █████ █████ ██ ███████ ████ ███ ███ ██ ███ █████████
b
The technology of ████████████ ██████████ ███ ██████████ █████████████ ████ ████████ █████████████ ██████████ ██ ███████ ██████████ ██ ████ ████ ███ ████ ███████ ██████
c
After years of █████████████ █████████ ██████ ██ █ ██████ ████████████████ █████ ███ █████████ ██ ██████ ██████████ ████ █████████ ████ ██ █████████ ███████████ ████ █████████ ████ █████ ██ ███████████████ ████ ██ ██████ ████ ██ ██████
d
Recent research provides ████████ ████ ████████ █████ █████ █████ ████████ █████ ███ █████████ ██ ████████ ████ ████ ██ ████ ███ ██ ███████ ███████ ████ ████ ███████████ ██ ██████████ ███████████ ██ █████████ ███████ ███ ███ ███ ███ ██████ ██ ████ ███ ████████
e
Contrary to a ████████ ████ ███████ ██████████ ███████████ ██ █████████ ███████ ███ ███ ███ ███ ██████ ██ ████ ███ █████ ███████ ███ ███ ███ ██ ███ ███████ ██ █████ ██████ ███ ████████ ██████ ███████ ████ ███ ████████████ ███████████