细条状粪便常见于（）
A.痔疮
B.直肠癌
C.细菌性痢疾
D.便秘
E.肛裂
参考答案：B
________ on the small island, the tower has been seriously damaged by the sea water?[ ]
A. Being lain
B. Lain
C. Being located
D. Located
试述商品的供给和需求与商品价格变动的关系。
