What is the best title for this passage? Which countries have probably spent the most money on maglev research?

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问题 What is the best title for this passage?
Which countries have probably spent the most money on maglev research?

选项 A、France and West Germany.
B、Japan and West Germany.
C、the United States and Japan.
D、West Germany and the United States.

答案B

解析最后两句提到联邦德国和日本已有几个实际运作模型，而美国在这方面的研究落后了，可见联邦德国和日本花钱最多。

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GCT工程硕士（英语）

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