题干
——Mr Li, I can't understand everything in class.
——Don't worry! I'll _____ _ the main points at the end.
A：record
B：review
C：require
D：remember
答案(点此获取答案解析）
B
2X+2TiCl4+6CO，②TiCl4+2Mg
Ti+2MgCl2．