问题:
A . base of the flames,moving the horn from side to side,following the flames upward as they diminish
B . top of the flaming area,moving the horn from side to side,following the flames downward as they diminish
C . center of the flaming area,moving the horn vertically from top to bottom
D . bottom of the flaming area,moving the horn vertically to the top following the flames upward as they diminish
● 参考解析
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