Slow Down, Sara!

ISBN: 9781575651255

作者: Page Eastburn O'Rourke

出版社: Lerner Pub Group

页数: 32

定价: $ 6.72

装帧: Pap

内容简介

Ben is worried when his friend "Speedy" Sara slows down just before the soapbox race, but she is using science to improve her chances.