题目

将钠在空气中燃烧，产物的化学式为 ；某无色气体与空气接触后，气体的颜色由无色变成红棕色，则原气体为  。 答案：Na2O2 NO根据句意及首字母提示在横线处填上恰当的单词，使句子意思完整，语法正确。  l.  If I had a m_______dollars,1 would build a school for the poor children in the village.  2.  Do you like wearing a shirt and t________to take part in a party?  3.  They do medical r________with animals such as dogs and white mice.  4.  There are many p_______on my face.  They look very ugly.  What should I do?  5.  My only w______is that l won't be allowed to take a vacation with my parents.  6.  I don't have a present.  What i_______everyone else brings a present?