问题
填空题
考考你的记忆力，根据句意及首字母补全在本课中出现的单词。
1.My head is always t____.
2.My favourite class is physical e___.
3.Everyone laughed,e___ the teacher.
4.Mr.Liu gives uslots of interesting p___ in English class.
5.We have a math e___ on Friday.
答案
1.tired 2. education 3.except 4.projects 5.exam
VO2++V3++H2O，装置如下图所示：