雄黄的主成分是（）
A.含水硫酸钠
B.含水硫化汞
C.硫化钙
D.硫化砷
E.三氧化二砷
参考答案：D
She made as many men as she could _____ her pain. [ ]
A. shared
B. share
C. to share
D. sharing
地球上陆地占地球表面的 %，而海洋占 % 。
