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．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
A．the box of bricks B．the ladder C．the top of the buliding D．the pulley