做功和热传递都可以改变物体的内能．给自行车轮胎打气的气筒连续使用一段时间就会发热，这是由于____ 使气筒的内能____ （第二空选填“减少”或“增加”）．

连词成句。

增加：在缺词处加一个漏词符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（﹨）划掉。

修改：在错的词下划一横线（____），并在该词下面写出修改的词。

注意: 1).每处错误及修改均仅限一词；

2)．只允许修改10处，多者（从第11处起）不计分。

    My dream is to become a school teacher in the future. In fact, I had the dream of becoming a teacher since my childhood. In my opinion, without teachers, no society could make progresses. There is no doubt whether teachers play an important role in children growth. Not only do teachers pass on knowledge for children, but they also teach children how to behave themselves. Comparing with other jobs, teaching is hard and the pay is lower. And to me, what great fun it is to be with children! They make me to feel young forever because I'll study harder and try my best to realize my dream.

生活中许多物体可以发光，下列物体不属于光源的是（　　）