题目

听材料，回答问题。 （1） What will the woman do on Saturday? A . See a film. B . Do the housework. C . Visit her parents. （2） When did the man's family move to the US? A . Before he was born. B . When he was a young child. C . When he was a teenager. （3） What do we know about boys in Indian families? A . They don't help with the housework. B . They're expected to work at an early age. C . They must take care of their sisters.生物医学研究人员测定某人的肺泡、静脉血和组织细胞内氧气以及二氧化碳含量的相对值，结果如表．据此判断：能代表组织细胞的序号是（　　）气体①②③④氧气4030100102二氧化碳46504240A．①        B．②            C．③         D．④