题目

呼吸作用为生命活动提供了（   ） A．能量                 B．糖类                 C．二氧化碳           D．水分 答案：AMy mother _________ in the country, but now she _______ in the city and likes the city life.A.is used to living; used to liveB.is used to live; is used to livingC.used to live; used to livingD.used to live; is used to living