单项选择题

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单项选择题
A. The high temperatures required for its use.B. The high cost of materials used in its production.C. The lack of trained environmental engineers.D. The opposition of automobile manufacturers.
A. The high temperatures required for its use.
B. The high cost of materials used in its production.
C. The lack of trained environmental engineers.
D. The opposition of automobile manufacturers.
单项选择题
B
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