Goals: Grasp the usage of the new words.
Step I: Read the new words together.
Step II: Do some explanation about the new words.
1 preserve
A cell can be preserved for a thousand years.________________
Salt can preserve food from going bad.____________________
2. agreement
The two countries signed an agreement to jointly launch satellites______________
agree to 1)_____________ 2)_________________
agree on the plan ___________
agree wit h 1)______________2)______________
3 投资v ________ n.____________投资者___________
4.prehistoric___________preschool_________preview__________
5.remains n._________ _______v. ____________adj.___________
I am a teacher but he remains a farmer.
It remains to be proved.
