单项选择题

A. Sending the next package earlier.
B. Waiting patiently.
C. Using air freight.
D. Looking for the package.
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问答题
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.
单项选择题
A. How to care for precious metal. B. A standard unit for measuring weight.C. The value of precious metal. D. Using the metric system.
A. How to care for precious metal.
B. A standard unit for measuring weight.
C. The value of precious metal.
D. Using the metric system.
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