九年級英語全冊限時組合專練二課件新人教版(編輯修改稿)
2025-07-15 15:45 本頁面
【文章內(nèi)容簡介】 ). With its help, plastics can be turned into smaller parts and go away quickly. Scientists believe that, in the future, it could solve the problem of plastic pollution. 限時組合專練 (二 ) The enzyme is able to break down PET, a form of plastic. PET was first made in the 1940s and is now widely used to make plastic bottles. It can remain in the environment for many years and pollute large areas of land and water. So it has always been a headache to deal with the waste from PET and other plastics. 限時組合專練 (二 ) The researchers made the discovery(發(fā)現(xiàn) ) while examining the structure of a natural enzyme in Japan. They found that the natural enzyme was helping to break down PET plastics. So, they decided to make small changes to the enzyme by adding some amino acids(氨基酸 ). It made the natural enzyme39。s plasticeating abilities work faster and better. 限時組合專練 (二 ) John McGeehan, one of the lead researchers, said, “We39。ve made an improved enzyme. It39。s better than the natural one. And we are trying to make more improvements to it.” He went on, “The enzyme is not harmful to humans or animals, and it is friendly to the environment. So we are considering putting it into wider use.” 限時組合專練 (二 ) The team is now trying to make the enzyme break down PET in large quantities(大量地 ). “We39。ll see that the plastic pollution may be stopped with this technology. However, there is still a long way to go， ” John McGeehan added. 限時組合專練 (二 ) [主旨大意 ]英國和美國的科學(xué)家們研制出了一種可以分解塑料的酵素?？茖W(xué)家們覺得這種酵素能夠解決塑料污染方面的問題。 限時組合專練 (二 ) ( ) to the scientists, the enzyme may solve the problem of _______
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