Franklin used all of the following things EXCEPT ______.

A．1970 was World Conservation Year.
B．The United Nations wanted everybody to know that the world is in danger.
C．World Conservation is necessary.
D．It is the young people who are helping to save our worl

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