单项选择题

In the phrase "without setting up a network of interlocking crystals customarily associated with that process" in the second paragraph, a substitute for the word "customarily" may be ______.

A．continuously
B．certainly
C．eventually
D．usually
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单项选择题
According to the passage glass cools and becomes rigid differently from metals because ______.
A．it has an unusually low melting temperature
B．it does not set up a network of inter3ocking crystals
C．it has a random molecular structure of a liquid
D．it is made from a mixture of silica, lime, and soda
单项选择题
Glass can be easily molded into all kinds of forms because ______.
A．it melts like liquid when heated
B．it softens gradually through varying stages when heated
C．it retains the shape at the point when it is suddenly cooled
D．various heating techniques can be used in making glass
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