2. 外语
  3. What is the main idea of the passage? The energy is saved because ______.

What is the main idea of the passage? The energy is saved because ______.

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问题 What is the main idea of the passage?
The energy is saved because ______.
选项 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
答案D
解析 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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