How many new materials are mentioned in this passage? Why is transition difficult?

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问题 How many new materials are mentioned in this passage?
Why is transition difficult?

选项 A、Because transition requires money and time.
B、Because many manufacturers are unwilling to change their equipment.
C、Because research on new materials is very difficult.
D、Because it takes long time.

答案A

解析由短文最后一段中的"And that transition could prove difficult，for switching requires lengthy research and investment"可知答案。

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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 is transition difficult?

公共英语五级笔试

公共英语（PETS）

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