题目

阅读理解Thisis a common situation for beginner-level language learners—they want to readclassic(经典的)books, but what their language skills allow are usually little more thanchildren's books.OxfordUniversity Press tried to solve this problem back in 1988 by designing a seriesof graded English reading materials known as the Oxford Bookworms Library. Itnow has a collection of over 200 books—many of them simplified versions ofclassics—which fall into seven difficulty levels from starter levelto level six. However,there has always been a debate over whether shortened versions of clas6．关于加速度，以下说法正确的是（　　）A．加速度增大，速度就一定增大B．物体有加速度，其速度就一定增加C．物体加速度很大，速度可能为零D．速度很大的物体，其加速度一定很大