How many new materials are mentioned in this passage? Why could not ceramics be used widely in the past?

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问题 How many new materials are mentioned in this passage?
Why could not ceramics be used widely in the past?

选项 A、Because of their brittleness.
B、Because people didn’t know how to use them.
C、Because they were not useful.
D、Because they could not resist heat.

答案A

解析

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本试题收录于：公共英语五级笔试题库公共英语（PETS）分类

公共英语五级笔试

公共英语（PETS）

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How many new materials are mentioned in this passage? Why could not ceramics be used widely in the past?

公共英语五级笔试

公共英语（PETS）

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