废旧电池集中处理的首要原因是 [ ]
A.回收电池中的石墨电极
B.回收电池外壳金属材料
C.防止电池中汞、铜等重金属对土壤和水源的污染
D.防止电池中的渗出液蚀其他物品
答案:C
Professor William is by far kindest man and half population of the city knows him.[ ]
A. the; the
B. a; the
C. /; a
D. a; a
八种法