英语六级作文：Plankton浮游生物
在学习、工作或生活中，大家都不可避免地会接触到作文吧，作文是从内部言语向外部言语的过渡，即从经过压缩的简要的'、自己能明白的语言，向开展的、具有规范语法结构的、能为他人所理解的外部语言形式的转化。那么你有了解过作文吗？以下是小编精心整理的英语六级作文：Plankton浮游生物，仅供参考，希望能够帮助到大家。
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.
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