题目

下列四组生物中，代谢类型属于异养需养型的一组是 A．木耳和乳酸菌                                           B．水螅和草履虫     C．蛔虫和大肠杆菌                                        D．根霉和草莓 答案：B—What _____ Yu Ping usually _____ in her free time?—She usually goes to the library.A. do; do B. is; doing C. does; does D. does; do