题目

Greatly_________ as the leading scientist,he was asked to give lectures in many countries. A.respecting                               B.respects C.respected                                D.to respect 答案：C人体的结构层次按由小到大顺序排列的一项是（ ）A．细胞→组织→器官→系统→人体?B．细胞→组织→系统→器官→人体C．细胞→器官→系统→组织→人体?D．人体→系统→器官→组织→细胞