【单选题】breeding/breathing
A.
These animals aren't breeding.
B.
These animals aren't breathing.
【简答题】How are the breeding programs going with most animals?
【简答题】Breeding a wild plant into a major food crop requires ________.
【判断题】某 DNA 提取液经紫外吸收测定 OD260/OD280 ≥ 1.8 ,则该溶液中蛋白质杂质基本除去