题目

人体白细胞吞噬入侵细菌的方式属于（   ） A.自由扩散       B.协助扩散       C.胞吞         D.胞吐  答案：C I’m very ___ because my best friend didn’t invite me to come to his party.         A . popular    B.  happy    C.  late    D . upset