题目

链状单炔烃完全燃烧后生成的二氧化碳与水的物质的量之比为5∶4，满足上述条件的烃的种数共有（    ）A.3种              B.4种                C.5种               D.6种 答案：AAnnie often tells her classmates ______ at the remote school in the mountain area and what she has done there as a volunteer. A．life is how hard       B．what hard life is C．how hard life is       D．how hard is life