单选题
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
【正确答案】
B
【答案解析】
从第三段中第二句话可以得到答案。
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