Complete the summary below using NO MORE THAN TWO WORDS from the passage.Write

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问题 Complete the summary below using NO MORE THAN TWO WORDS from the passage.
Write your answers in boxes 33-38 on your answer sheet.
The use of talc powder in olive oil industry in Spain has been around for【R1】_____ years. It is extremely useful in dealing with difficult olives which often produce a lot of【R2】_____due to the high content of solid matters.
The traditional method of oil extraction used in some smaller plants often produces【R3】______, which contains emulsified oil, and if it is directly disposed of it may be【R4】______to the environment, because it cannot【R5】______. But adding talc powder can absorb the emulsifier and increase the production, because the size of oil【R6】______grows. [br] 【R5】

选项

答案 biodegrade

解析这两道题答案都对应68页68页第二段倒数第二行“the emulsified oil may takesome time to biodegrade and so be harmful to the environment”，所以答案为harmful和biodegrade。

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