单项选择题
A．is always B．hopes for a change C．never stops changing D．will live a different life
A．man has been growing taller over the past 500 years B．man has got stronger eyes than he ever had C．man's hair is getting thinner and thinner D．man's limbs are getting weaker because he tends to make less use of them
A．the release of artificial or natural substances into the environment B．the production of new industrial goods C．increased amounts of a natural substance D．our ever-increasing population