问题
When something is on fire, people throw sand on it to put out the fire. The main use of the sand is to _________.
A:protect the thing on fire
B:add weigh to the thing on fire
C:keep the air away from the thing on fire
D:lower the temperature of the thing on fire ;
B:add weigh to the thing on fire
C:keep the air away from the thing on fire
D:lower the temperature of the thing on fire ;
正确答案是：
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