单项选择题

A．Three times.
B．Six times.
C．Eight times.
D．Twelve times.
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单项选择题
A．Lifted heavy box.B．Put hundreds of bottles and tins and packets on shelves.C．Lifted bricks.D．Lifted bottles and boxes.
A．Lifted heavy box.
B．Put hundreds of bottles and tins and packets on shelves.
C．Lifted bricks.
D．Lifted bottles and boxes.
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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