六级He excelled in studies and received his PhD in plant pathology (病理学)and genetics in 19
From 1942 to 1944, Borlaug was employed as a microbiologist at DuPont in Wilmington.
他在研究方面表现出色,并获得了植物病理学博士学位(病理学)和遗传学
2013年6月六级考试真题(三)
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