Todaythequalityofournaturalenvironmenthasbecomeanimportantissue.Theworldpopulationisrisingsoquicklythattheworldhasbecometoocrowded.Weareusingupournaturalresourcesandatthesametimepollutingourenvironmentwithdangerouschemicals.Ifwecontinuetodothis,lifeonearthcannotsurvive. 現(xiàn)如今我們的自然環(huán)境已經(jīng)成為一個重要問題。世界人口增長如此之快以至于世界已經(jīng)變得 (共 1014 字) [閱讀本文] >>