题目

I ________ Beijing in a few days. Do you know when the earliest plane ________? A . am leaving for; takes off B . leaves for; takes off C . am leaving for; is taking off D . leave for; is taking off 答案：A14．如图中CO2代表二氧化碳，H2O代表水，图中③④分别代表的生物是（　　）A．动物、动物B．植物、动物C．动物、细菌和真菌D．细菌、真菌