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

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
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