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.
填空题
The popularity O{Chinese in the world makes the“Chinese TOFEL”，the _____________________ exam，possible．
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