【英语活动】__ [第23天]一个月帮你攻克考研词汇--截止日期6月30日

1 科学家们还不知道恐龙灭绝的原因，但是有些理论假设：可能与地理、气候以及海平面的变化有很大关系。
2 园艺学，在主要涉及产量最大化和质量最优化方面，是利用来自其他很多学科的知识。
3 雪可以帮助农民保持土壤里温度，所以土地里的种子就免受冻害侵扰。

1 Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography,climate, and  sea levels were responsible.
2 The science of horticulture, in which the primary concerns are maximum yield and superior quanlity, utilizes information derived from other sciences.
3 Snow aids farmers by keeping heat in the lower ground levels, thereby saving the seeds from freezing.