单选题
The energy is saved because ______.
A、
the factory only needs ten people to produce glasses
B、
in the new way, broken bottles can be used, too
C、
the inventors received worldwide patent rights to own the process they developed
D、
the glass is heated to strengthen it
【正确答案】
D
【答案解析】
[分析] 见文章第八段指出的节能关键：“The energy is saved because the glass is not melted. The glass is heated，however，to strengthen it．”。
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