单项选择题

A．How to care for precious metals.
B．A standard Unit for measuring weight.
C．The value of precious metals.
D．Using the metric system.
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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
Why were many laid-off workers at a loss
A．Because they didn't get used to the new way of life.
B．Because they are too old to find a new job.
C．Because they dislike being laid off.
D．Because they think they lost their social status.
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