嗜酸细胞性胃肠炎的药物治疗首选（）
A.青霉素
B.泼尼松
C.奥美拉唑
D.5-氨基水杨酸
E.甲氨蝶呤
参考答案：B
Many leaders of the world got together in Copenhagen in order to find ways for people all over the world to ______ the nature.
A．take part in
B．put an end to
C．be in harmony with
D．draw attention to
硫化氢分压（或硫化氢含量）对硫化效果有何影响？
