题目

下列哪种物质是人体生命活动的主要能量来源（ ） A . 脂肪 B . 水 C . 维生素 D . 糖类 答案：D School cleaning dayToday is Saturday. It is our cleaning day. The pupils of our class are cleaning our classroom. Mary is cleaning the door. She is standing on a chair. Tom and some others are cleaning the windows. Some of us are sweeping the floor. Others are cleaning the desks and chairs. I am taking down the old pictures and putting up some new ones. Our teacher is in the classroom，too. She is helping us to put the desks and chairs in order.【1】What day is it today?A. Sunday. B. Saturday. C. Monday D. Friday.【2】The pupils are _____ .A. standing on a chairB. cleaning the windowC. cleaning the desksD. cleaning the classroom【3】The teacher is helping us to __ .A. put the desks and chairs in orderB. sweep the floorC. clean the windowD. take down the pictures【4】Mary is _____ .A. cleaning the doorB. cleaning the windowsC. sweeping the floorD. cleaning the desks and chairs【5】Why do the pupils come to school?A. To study. B. To clean the classroomC. To learn English. D. To see their teacher.