1. It is one of natures great ironies that the availability of nitrogen in the soil frequently sets an upper limit on plant growth even though the plants leaves are bathed in a sea of nitrogen gas.(3+)下述情形真可谓是自然界的一个莫大讽

发表于:2019-02-01 / 阅读(29) / 评论(0) 分类 GRE英语

Onesuchnovelideais thatofinsertingintothechromosomes (25)ofplantsdiscretegenesthatarenot apartoftheplants’naturalconstitution: specifically,theideaofinsertinginto nonleguminousplantsthegenes,ifthey c

发表于:2019-02-18 / 阅读(40) / 评论(0) 分类 英文语法词汇