There is not much time left for you to cover everything you'd better ______ unimportant points.

A．For example
B．Such as
C．If
D．And so on

A．our natural surroundings are in danger of being destroyed by industry
B．the fixed supply of natural resources marks a point beyond which economic growth cannot continue
C．the world population is ever increasing
D．more efforts should be made to improve the quality of our material life