单项选择题

A. They are at a violin shop.
B. They are at a circus.
C. They are at a concert.
D. They are inside a movie theatre.
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单项选择题
A. A more economical diesel fuel. B. Characteristics of a new type of fuel. C. Where a new energy source is located. D. How to develop alternative energy sources.
A. A more economical diesel fuel. B. Characteristics of a new type of fuel.
C. Where a new energy source is located. D. How to develop alternative energy sources.
单项选择题
A. Less than 30 minutes. B. From 30 to 45 minutes. C. At least 45 minutes. D. More than 30 minutes.
A. Less than 30 minutes. B. From 30 to 45 minutes.
C. At least 45 minutes. D. More than 30 minutes.
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