阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。After about a century of research, scientists in Switzerland have finally solved the mystery of the holes in Swiss cheese. Despite what you may have been told aschild, the holes are not caused by mice nibbling away inside cheese wheels.(expert) from Agroscope, a state center for(agriculture) research, said the phenomenon was caused by tiny bits of hay (干草) present in the milk during the cheese-making process and not bacteria as(previous) thought. They found that the mysterious holes became smaller or disappeared when milk(use) for cheese-making was extracted using modern methods. "It's the disappearance of the traditional bucket used during milking that played a significant rolethis transformation," said Agroscope spokesman Regis Nyffeler,(add) that bits of hay fell into the milk and then eventually caused the holes. According to Agroscope scientists, Swiss cheeses had fewer holes over the past 10 to 15 years as open buckets(replace) by sealed milking machines,removed tiny hay particles from the milk. This discovery not only solves a long-standing mysteryhighlights the interesting intersection (交叉) of tradition and technology in food production.
答案:【1】a【2】Experts【3】agricultural【4】previously【5】used【6】in【7】adding【8】were replaced【9】which【10】but