Franklin used all of the following things EXCEPT ______.

A．improve our technology in planting trees
B．try our best to save the world
C．hear about the record called NO ONE'S GOING TO CHANGE OUR WORLD
D．change the earth

A．there has been a lot of conservation in Holland
B．Holland does not need so many plants, trees and flowers
C．many plants, trees and flowers don't grow there any more
D．some plants, trees and flowers are dangerous