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单选题
The presence of oxygen, however, serves to accelerate combustion, and causes materials to burn with great intensity.
A
However, oxygen is presented to provide service to the combustion process and improve the burn intensity of the material.
B
However, the presence of oxygen helps to advance the combustion and results in an intense burn of material.
C
However, the existence of oxygen inhibits the acceleration of combustion and leads to a strong burn of material.
答案解析
正确答案：B
