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  3. What is the best title for this passage? According to the passage, when could people start using a maglev commercially?

What is the best title for this passage? According to the passage, when could people start using a maglev commercially?

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问题 What is the best title for this passage?
According to the passage, when could people start using a maglev commercially?
选项 A、In 5 years.
B、In 10 years.
C、In 20 years.
D、In more than 20 years.
答案B
解析 根据第一个句子"The next decade could see..."可以确认答案。
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