纸质包装材料包括纸、纸板及其制品，其在包装材料中处于次要地位。( )
参考答案：错
The workers in the Huashan Mountains have to rubbish to keep the mountains clean.[ ]
A. turn up
B. pick up
C. mix up
D. give up
萨拉曼卡宣言
