英語六級作文：Plankton浮游生物

　　在學習、工作或生活中，大家都不可避免地會接觸到作文吧，作文是從內部言語向外部言語的過渡，即從經過壓縮的簡要的'、自己能明白的語言，向開展的、具有規範語法結構的、能為他人所理解的外部語言形式的轉化。那麼你有了解過作文嗎？以下是小編精心整理的英語六級作文：Plankton浮游生物，僅供參考，希望能夠幫助到大家。

　　scattered through the seas of the world are billions of tons of small plants and animals called plankton. most of these plants and animals are too small for the human eye to see. they drift about lazily with the currents, providing a basic food for many larger animals.plankton has been described as the equivalent of the grasses that grow on the dry land continents, and the comparison is an appropriate one. in potential food value, however, plankton far outweighs that of the land grasses. one scientist has estimated that while grasses of the world produce about 49 billion tons of valuable carbohydrates each year, the sea＇s plankton generates more than twice as much.despite its enormous food potential, little effect was made until recently to farm plankton as we farm grasses on land. now marine scientists have at last begun to study this possibility, especially as the sea＇s resources loom even more important as a means of feeding an epanding world population.no one yet has seriously suggested that " plankton-burgers" may soon become popular around the world. as a possible farmed supplementary food source, however, plankton is gaining considerable interest among marine scientists.one type of plankton that seems to have great harvest possibilities is a tiny shrimp-like creature called krill. growing to two or three inches long, krill provides the major food for the great blue whale, the largest animal to ever inhabit the earth. realizing that this whale may grow to 100 feet and weigh 150 tons at maturity, it is not surprising that each one devours more than one ton of krill daily.