问题
选择题
氢化钙可以作为生氢剂(CaH2中氢元素为-1价)，反应的化学方程式如下：CaH2+2H2O==Ca(OH)2+2H2↑，其中水是 [ ]
A．氧化剂
B．既不是氧化剂也不是还原剂
C．还原剂
D．既是氧化剂又是还原剂
答案
答案：A
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氢化钙可以作为生氢剂(CaH2中氢元素为-1价)，反应的化学方程式如下：CaH2+2H2O==Ca(OH)2+2H2↑，其中水是 [ ]
A．氧化剂
B．既不是氧化剂也不是还原剂
C．还原剂
D．既是氧化剂又是还原剂
答案：A
At our school, we sometimes have a special day to help others. Last year we went to an old people's home and sang songs and performed a play for them. 小题1: We should be allowed to take time to do things like that more often. 小题2: I want to be a teacher when I'm older, so it would be a great experience for me. 小题3: . For example, my friend Tian Ge wants to write for a newspaper. She should be allowed to volunteer at the newspaper office once a week. 小题4: Some students should be allowed to have Friday afternoons off to volunteer and help others.
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