题目

Before I read this passage,I had nothat a company mightyou into buying a product. A . cure; fool B . campaign; trick C . comprehension; fool D . comment; trick 答案：C关于淀粉和纤维素的关系，下列叙述正确的是(    ) ①组成都符合Cm(H2O)n  ②都无还原性  ③都是天然高分子化合物  ④互为同分异构体  ⑤互为同系物A.①②③                B.①②                  C.②④                    D.④