Automobiles
Automobiles,?as?a?product?of?modern?civilization,?have?been?playing?a?vital?part?in?the?daily?activities?of?human?society.?Industry?needs?automobiles?for?farming?as?well?as?transportation.?Every?day,?automobiles?drive?people?to?and?from?work.?On?weekends?automobiles?take?families?for?joyful?outings.?And?during?holiday?seasons,?automobiles?fill?the?highways?everywhere,?even?in?remote?areas.?It?could?be?said?that?the?wheels?of?automobiles?move?society?forward.
But?automobiles?have?also?given?rise?to?a?series?of?problems.?For?example,?cities?are?overcrowded?with?automobiles.?They?create?a?lot?of?noise?and?traffic?accidents?which?disable(傷殘)?or?kill?many?people?each?year.?Worst?of?all?perhaps?is?the?air?pollution?caused?by?the?exhaust?gases?produced?by?automobiles.?Some?of?the?gases?are?highly?toxic(有毒的)?and?a?serious?health?hazard.
