单项选择题

A．Ordeal
B．Assessment
C．Practice
D．Experiments
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单项选择题
At the present time the brush can NOT be used to ______.
A．sweep up tiny pieces of nanodust
B．paint microstructures
C．soak toxins from water
D．find medical uses
单项选择题
The British government calls for ______.
A．international cooperation
B．reducing the use of aviation fuel
C．levying high tax on the aviation fuel
D．alternatives for the aviation fuel
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