单项选择题
A．air pllution B．both the litter problem and waste of resources C．excess consumption D．unnecessary buying
A．the production of new industrial goods B．increased amounts of natural substance C．our ever-increasing population D．the release of artificial of natural substances into the environment
A．urging their governments to control litter and waste B．cutting down the use of oil and other oil products C．reducing unnecessary buying, over-consumption and careless disposal of wastes D．Making anti-pollution advertisements