新托福TPO-21综合写作详细解析(二十一)(共6页).docx

精选优质文档-倾情为你奉上智课网TOEFL备考资料新托福TPO 21综合写作详细解析（二十一） 摘要： 新托福TPO 21综合写作详细解析 阅读材料： Genetic modification, a process used to change an organisms genes and hence its characteristics, is not being used to improve trees. Through genetic modification, it is possible to create trees that produce more fruit, grow faster, or withstand adverse conditions. Planting genetically modified trees on a large scale promises to bring a number of