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Algae seem harmless enough. These precursors to plants thrive throughout the world's waters. But these single-celled plants have global consequences. We can thank them for oxygen in the atmosphere, oil in the lithosphere as well as dead zones in the
Scientific American(十一)月
This is the VOA Special English Agriculture Report. The search for new fuels has led some researchers to algae. Algae is a name for thousands of different organisms. They include single-celled plants as well as kelp and other large plants. Blue-gree
VOA慢速英语2008年（十二）月
This is the VOA Special English Agriculture Report. The search for new fuels has led some researchers to algae. Algae is a name for thousands of different organisms. They include single-celled plants as well as kelp and other large plants. Blue-gree
VOA慢速英语2008年（十二）月
MARY LOUISE KELLY, HOST: Summertime brings algae blooms to many parts of the country - those mats of bright green organisms that can blanket waterways. In places like Florida's Lake Okeechobee, the blooms hurt tourism. They kill fish. They threaten w
2018年NPR美国国家公共电台7月
1．used to可看作一个半助动词或情态动词，其后跟动词原形，表示过去的习惯或经常发生的动作，例如： When he was a child, he used to ask lots of questions. I want to know the places (that/which) he used to go to. 否
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