精选优质文档-倾情为你奉上 I.words and expressions wordsshark, fin, cruel, harmful, chain, ecosystem, industry, law, scientific, afford, reusable, transportation, recycle, napkin .phrasesbe harmful to, at the top of, the food chain, take part in, turn off, pay for, take action.II.Language points1. When people catch sharks, they cut off their fins and throw the shark back into the ocean.cut off 切掉e.g. Take care not to cut off the buds. 当心不要把幼芽儿切掉。【拓展】“动词+ o