单项选择题
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．the less pollution we have B．the harder pollution can be done away with C．the more pollution there will be D．the more easily pollution can be controlled
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