题目

It's his positive attitude life that makes me admire him. 答案:【1】toward (s) /to14.小明和小亮自制了一款带透明玻璃罩的LED台灯,如图所示灯泡发光时,电能转化为光能,还转化为热能,使纸扇下方的空气温度升高,密度减小,向上流动,与上方的空气交换,形成对流,纸扇就开始转动起来了.
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