单项选择题

A．Because they are sister and brother.
B．Because they lost connections for a long time and he wants to keep in touch with her.
C．Because they are best friends.
D．Because Mike wants some advice from Sue for job interview.
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单项选择题
Rocker fuels are more explosive than methane gas because of ______.
A．the temperature at which combustion takes place
B．the degree of oxidation accomplished by the combustion process
C．the presence of inhibitors
D．the great burning velocity
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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