问题
多项选择题
常用的吸声材料包括（）。
A.无机材料
B.有机材料
C.多孔材料
D.无孔材料
E.纤维材料
答案
参考答案：A, B, C, E
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常用的吸声材料包括（）。
A.无机材料
B.有机材料
C.多孔材料
D.无孔材料
E.纤维材料
参考答案：A, B, C, E
It was a Saturday morning. When Mrs Green looked_ __into the sky, she smiled and said, “It’s going to be a fine day.” She woke her son up___ _eight and said, “Get up, Teddy. We are going to the zoo_ ___.Wash your face and eat your__ __quickly. We are going to New York by __ ____.” Teddy was very__ ____, because he liked going to the zoo and taking a train. He said, “I dreamed _ _the zoo last night, Mum.” His mother was _ ____, but she stopped and smiled. “You did, Teddy?”She said, “And what did _ _do in your dream?” “You know,Mum.You were in__ _dream,too.”
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