单项选择题

All the following could be defined as combustion EXCEPT ______.

A．a quietly burning flame
B．an explosion
C．a radiator giving off heat
D．the drying of oil based paint
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单项选择题
From the passage we can conclude that ______.
A．the relationships between the salesperson and the customer and the packaging of the product play a very important role in selling process
B．the first thing people should care about is quality
C．American company is wiser than German company
D．you can take any measure in order to promote sales
单项选择题
The major difference between oxidation and fire is that ______.
A．their burning velocities differ in rate
B．oxidation is a chemical reaction while fire is a physical reactionp
C．oxidation does not create heat
D．they occur at different temperatures
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