单项选择题

Passage One

A. Synthetic fuel. B. Solar energy.
C. Alcohol. D. Electricity.
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单项选择题
B
单项选择题
A. Boss and employee. B. Teacher and student. C. Passersby. D. Father and daughter.
A. Boss and employee. B. Teacher and student.
C. Passersby. D. Father and daughter.
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