选词填空。

    Deng Feng is my friend．He is____and interested in music．He usually gets up at 6：00 in the morning and then he does some____in the park．He likes to listen to____music When exercising．Before going to bed，he listens to some____of light music．Sometimes he'd like to enjoy traditional Chinese music．He____it's a good way to relax．Some day,he will study music and be a musician．

我是拼音小能手

物理学中，常用新的物理量对不同事物进行比较，比如要比较物体运动的快慢，需要引入速度；要比较做功的快慢，需要引入____；要比较____作用效果，需要引入压强．