题目

Homeschool materials are every where .In fact, as a homeschool parent, one of the best learning tools you can use is making use of songs. Think of it .When you hear your favorite songs come on the radio and as soon as the lyrics begin , you can join in at once and sing along. Perhaps,  you haven’t heard this song for months or even years! Doesn’t it amaze you? There is no doubt that learning through lyric and rhyme(韵律)is a great way! With some careful searching , you can come up with many songs ,lyrics ,and rhymes that fit well with your homeschool lesson plan or unit study. S计算：=（          ）；一种细菌半径是1.21×105米，用小数表示为（           ）米。