谢谢你了呀    ，    有这个单元的教案吗

如果在充实一点就好了

谢谢分享，先顶一下啦！

Thank you a lot!!!!!!!

非常感谢，先下了~~~

Thank you very much

Thank you very much!

呵呵,以前下过这课件呢

thanks a lot. good.

thank you very much！