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.
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单项选择题
A．To check the accuracy of scales.B．To calculate the density of other metals.C．To observe changes in the atmosphere.D．To measure amounts of rainfall.
A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.
单项选择题
A．He was fired from his job.B．He was warned about being more punctual from now on.C．The management cut his working hours.D．He was promoted.
A．He was fired from his job.
B．He was warned about being more punctual from now on.
C．The management cut his working hours.
D．He was promoted.
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