The success of a country in the New Age of Superstuff lies in________.

A．Because transition requires money and time.
B．Because many manufacturers are unwilling to change their equipment.
C．Because research on new materials is very difficult.
D．Because it takes 10 years.

A．To compare them with the new materials.
B．To show the significance of the new materials on the future world.
C．To compare the new materials to them.
D．To explain his viewpoint.