once upon a time there was a baby eagle living in a nest perched on a cliff overlooking a beautiful valley with waterfalls and streams, trees and lots of little animals, scurrying about enjoying their lives....

in the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. first, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clean...

an important new industry, oil refining, grew after the civil war. crude oil, or petroleum - a dark, thick ooze from the earth - had been known for hundreds of years, but little use had ever been made of it....

icebergs are among nature＇s most spectacular creations, and yet most people have never seen one. a vague air of mystery envelops them. they come into being ----- somewhere ------in faraway, frigid waters, amid...

from this cartoon, we can see that at the top end of the river,is a chemical factory and a paperrnaking factory which send out and poisonous wastes....

世界人口新千年的前50年對世界人口來說是至關(guān)重要的，到2050年，世界人口將趨于平穩(wěn)，但到那時，世界人口將達(dá)到100億，比現(xiàn)在多2／3。但人d增長率是我們現(xiàn)在能選擇的事：它不是順應(yīng)天意而產(chǎn)生的，而是人類的選擇。...

生存和毀滅地球上生命的歷史一直就是一部生物與其環(huán)境相互作用的歷史。在很大程度上，地球上動植物的形態(tài)以及習(xí)性都是由外部環(huán)境所塑造的。考慮到地球上生命存在的整個時間，相反作用即生命對其周圍環(huán)境的實際改變作用一卻相對很小。...

what you dtdn t know about money and happinessver the past 15 years,researchers have studied the connection between money and happiness. their findings shatter many misconceptions....